Some significant subject heading categories include the following (subject headings may be copied and pasted into the Keywords field):
- Buildings, including
- Buildings - Cabins
- Buildings - Campus
- Buildings - Ranger stations
- Lookout stations
- Fires, including
- Fire damage
- Fire detection
- Fire fighting
- Fire prevention
- Fire trucks
- Fires - Effects on vegetation
- Prescribed burning
- Forestry, including
- Cut-over lands
- Demonstration plots
- Erosion
- Forest plantations
- Forest products
- Forestry stations
- Nurseries
- Redwood Yield Study
- Regeneration
- Second growth
- Seed beds
- Seedlings
- Thinnings
- Whitaker's Forest
- Windbreaks
- Geographical features, including
- Canyons
- Creeks
- Lakes
- Mountains
- Rivers
- Watersheds
- Genus and species names in use at the time the photographs were taken, including
- Abies
- Pinus
- Pseudotsuga
- Quercus
- Sequoia
- Locations in California, including
- City and town names
- County names
- Locations outside California, including
- State names (U.S.)
- Canadian province names
- Foreign country names
- Logging, including
- Clearcutting
- Donkey engines
- Felling
- Log loading
- Log ponds
- Log transportation
- Logging camps
- Logging equipment
- Logging residues
- Lumber
- Lumber companies
- Lumber mill equipment
- Lumber mills
- Lumber transportation
- Lumber yards
- Selective logging
- Slash
- Tractors
- Trucks
- National and State Forests, Parks, and Reserves, including
- Sequoia National Forest
- Tahoe National Forest
- Yosemite National Park
- Native Americans, including
- Indian reservations
- Organizations, including:
- 4-H Clubs
- Forestry Club
- Personal names (see the following examples):
- Example 1: Searching on "Fritz, Emanuel" finds photographs where person is a subject (37 records)
- Example 2: Searching on "Emanuel Fritz" finds photographs where full name occurs in caption (28 records)
- Example 3: Searching on Fritz finds photographs where name occurs in caption (including forms such as E. Fritz or Prof. Fritz) or subject headings (244 records)
- Railroads, including
- Bridges and trestles
- Railroad cars
- Railroads - Equipment
- Roads, including
- Roads - Construction
- Roads - Environmental aspects
- Trees, including
- Trees - Age
- Trees - Age - Notable
- Trees - Diseases
- Trees - Growth
- Trees - Injuries
- Trees - Killing of
- University of California, including
- University of California - Campus
- University of California - Cooperative Extension
- University of California - Forestry
- University of California - Forestry - Camp Califorest
- University of California - Forestry - Faculty
- University of California - Forestry - Forestry Club
- University of California - Forestry - Students
- University of California - Forestry - Summer camp