Colour pocket map of Humboldt County, drawn by J N Lentell at the scale of 4 miles to 1 inch. O'Shaughnessy has made some edits to the map, adding in lumber companies, mills, the Buffalo syndicate and more. The map was published in 1893, but the edits are likely to have been made c. 1896.

Official map of Trinity County California, lists areas and owners of principal mines in Trinity County, compiled from local and government surveys. The map is drawn at 2 miles to 1 inch, and was surveyed by H L Lowden and J F Johnson. O'Shaughnessy has made some handwritten notes on the map. The map was published in 1894, but it is likely O'Shaughnessy's edits were c. 1896.

Official map of Humboldt County compiled and drawn by Stanley Forbes at the scale of 2 miles to 1 inch.

Blueprint map showing the entrance to Humboldt Bay. Surveyed by the USA's Corps of Engineers to accompany an annual report. Drawn at a scale of 600 feet to 1 inch.

Map of Humboldt Bay, California to accompany a report by M M O'Shaughnessy. (Referred to only, but does not seem to be included in this archive). Drawn at scale of 2,500 feet to 1 inch.

Grid map showing railroad routes from Humboldt Bay to the Sacramento Valley, to accompany a report by M M O'Shaughnessy. (Referred to only, but does not seem to be included in this archive). Drawn at a scale of 3 miles to 1 inch.

Profile showing railroad routes from Humboldt Bay to the Sacramento Valley, to accompany a report by M M O'Shaughnessy. (Referred to only, but does not seem to be included in this archive).

Grid map showing the Eureka Slough and Baby Island to the North. It shows various blocks marked as: Weck Addition, Huntoon Addition, Gill Addition, Lentell Addition.

Has not been digitised. Map of the Sierra Nevada.