| Line | Image | Collection | Title |
| 1 | | HCC Maps | Geology of the Coast Ranges in the Klamath and Part of the Ship Mountain Quadrangles, Del Norte County, California. OFR 82-16 SF |
| 2 | | HCC Maps | Geology of the Coyote Peak Quadrangle, Humboldt County, California. OFR 82-15 SF |
| 3 | | HCC Maps | Geology of the Rodgers Peak Quadrangle, Humboldt County, California. OFR 82-14 SF |
| 4 | | HCC Maps | Geology and Geomorphic Features Related to Landsliding, Crescent City 7.5' Quadrangle, Del Norte County, California. OFR 82-21 SF |
| 5 | | HCC Maps | Geology and Geomorphic Features Related to Landsliding, Scotia 7.5' Quadrangle, Humboldt County, California. OFR 82-20 SF |
| 6 | | HCC Maps | Geology and Geomorphic Features Related to Landsliding, Bridgeville 7.5' Quadrangle, Humboldt County, California. OFR 83-23 SF |
| 7 | | HCC Maps | Geology and Geomorphic Features Related to Landsliding, Bull Creek 7.5' Quadrangle, Humboldt County, California. OFR 83-3 SF |
| 8 | | HCC Maps | Geology and Geomorphic Features Related to Landsliding, Garberville 7.5' Quadrangle, Humboldt County, California. OFR 83-26 SF |
| 9 | | HCC Maps | Geology and Geomorphic Features Related to Landsliding, High Divide 7.5' Quadrangle, Del Norte County, California. OFR 83-18 SF |
| 10 | | HCC Maps | Geology and Geomorphic Features Related to Landsliding, Hiouchi 7.5' Quadrangle, Del Norte County, California. OFR 83-4 SF |
| 11 | | HCC Maps | Geology and Geomorphic Features Related to Landsliding, Miranda 7.5' Quadrangle, Humboldt County, California. OFR 83-25 SF |
| 12 | | HCC Maps | Geology and Geomorphic Features Related to Landsliding, Myers Flat 7.5' Quadrangle, Humboldt County, California. OFR 83-22 SF |
| 13 | | HCC Maps | Geology and Geomorphic Features Related to Landsliding, Redcrest 7.5' Quadrangle, Humboldt County, California. OFR 83-17 SF |
| 14 | | HCC Maps | Geology and Geomorphic Features Related to Landsliding, Smith River 7.5' Quadrangle, Del Norte County, California. OFR 83-19 SF |
| 15 | | HCC Maps | Geology and Geomorphic Features Related to Landsliding, Weott 7.5' Quadrangle, Humboldt County, California. OFR 83-6 SF |
| 16 | | HCC Maps | Geology and Geomorphic Features Related to Landsliding, Arcata North 7.5' Quadrangle, Humboldt County, California. OFR 84-38 SF |
| 17 | | HCC Maps | Geology and Geomorphic Features Related to Landsliding, Arcata South 7.5' Quadrangle, Humboldt County, California. OFR 84-39 SF |
| 18 | | HCC Maps | Geology and Geomorphic Features Related to Landsliding, Briceland 7.5' Quadrangle, Humboldt County, California. OFR 84-10 SF |
| 19 | | HCC Maps | Geology and Geomorphic Features Related to Landsliding, Buckeye Mountain 7.5' Quadrangle, Humboldt County, California. OFR 84-37 SF |
| 20 | | HCC Maps | Geology and Geomorphic Features Related to Landsliding, Capetown 7.5' Quadrangle, Humboldt County, California. OFR 84-34 SF |
| 21 | | HCC Maps | Geology and Geomorphic Features Related to Landsliding, Childs Hill 7.5' Quadrangle, Del Norte County, California. OFR 84-7 SF |
| 22 | | HCC Maps | Geology and Geomorphic Features Related to Landsliding, Ferndale 7.5' Quadrangle, Humboldt County, California. OFR 84-35 SF |
| 23 | | HCC Maps | Geology and Geomorphic Features Related to Landsliding, Harris 7.5' Quadrangle, Humboldt County, California. OFR 84-9 SF |
| 24 | | HCC Maps | Geology and Geomorphic Features Related to Landsliding, Honeydew 7.5' Quadrangle, Humboldt County, California. OFR 84-11 SF |
| 25 | | HCC Maps | Geology and Geomorphic Features Related to Landsliding, Requa 7.5' Quadrangle, Humboldt County, California. OFR 84-8 SF |
| 26 | | HCC Maps | Geology and Geomorphic Features Related to Landsliding, Taylor Peak 7.5' Quadrangle, Humboldt County, California. OFR 84-36 SF |
| 27 | | HCC Maps | Geology and Geomorphic Features Related to Landsliding, Blue Lake 7.5' Quadrangle, Humboldt County, California. OFR 84-6 SF |
| 28 | | HCC Maps | Geology and Geomorphic Features Related to Landsliding, Fields Landing 7.5' Quadrangle, Humboldt County, California. OFR 85-4 SF |
| 29 | | HCC Maps | Geology and Geomorphic Features Related to Landsliding, Fortuna 7.5' Quadrangle, Humboldt County, California. OFR 85-1 SF |
| 30 | | HCC Maps | Geology and Geomorphic Features Related to Landsliding, Hydesville 7.5' Quadrangle, Humboldt County, California. OFR 85-2 SF |
| 31 | | HCC Maps | Geology and Geomorphic Features Related to Landsliding, Korbel 7.5' Quadrangle, Humboldt County, California. OFR 85-5 SF |
| 32 | | HCC Maps | Geology and Geomorphic Features Related to Landsliding, McWhinney Creek 7.5' Quadrangle, Humboldt County, California. OFR 85-3 SF |
| 33 | | HCC Maps | Geology of the Iaqua Buttes 15-minute Quadrangle, Humboldt County, California. OFR 87-6 SF |
| 34 | | HCC Maps | Erosional Landforms, Landuse, and Channel Conditions as of 1936, Lower Klamath River Basin, California. Plate 1. |
| 35 | | HCC Maps | Erosional Landforms Active in 1936 and Erosional Landforms Caused by Late 1800's Major Flooding, Lower Klamath River Basin, California. Plate 2. |
| 36 | | HCC Maps | Landuse as of 1962-63, and Changes in Erosional Landforms and Channel Conditions 1936 to 1962-63, Lower Klamath River Basin, California. Plate 3. |
| 37 | | HCC Maps | Landuse as of 1966-69, and Changes in Erosional Landforms and Channel Conditions 1936 to 1962 to 1966-69, Lower Klamath River Basin, California. Plate 4. |
| 38 | | HCC Maps | Landuse as of 1974-75, and Changes in Erosional Landforms and Channel Conditions 1936 to 1962-63 to 1966-69 to 1974-75, Lower Klamath River Basin, California. Plate 5. |
| 39 | | HCC Maps | Existing Erosional Landforms and Channel Conditions as of 1974-75, Lower Klamath River Basin, California. Plate 6. |
| 40 | | HCC Maps | Salmonid Distribution Map. Plate 7. |
| 41 | | HCC Maps | Salmonid Habitat Quality Map. Plate 8. |