collections
 . archives
 . catalogs
 
datasets
 . survey data
 
events
 
geospatial works
 . geographic atlases
 . geologic sections
 . globes
 . maps
 . panoramic views
 . topographic profiles
 
graphic works
 . diagrams
 
images
 . art works
 . . art originals
 . . art prints
 . . art reproductions
 . . paintings
 . motion pictures
 . . animations
 . photographs
 . . aerial photographs
 . . orthophotographs
 . . photographs from space
 . remote-sensing images
 . . aerial photographs
 . . radar images
 
individuals
 . experts
 
models
 
multimedia packages
 
musical works
 
organizations
 
physical objects
 
projects
 
recordings
 . sound recordings
 . video recordings
 
services
 . interactive services
 . . chat services
 . . discussion lists
 . . games
 . . news groups
 . reference services
 . . cataloging rules
 . . classification systems
 . . dictionaries
 . . directories
 . . gazetteers (place names dictionaries)
 . . metadata standards
 . . subject heading lists
 . . thesauri
 
software packages
 . modeling software
 
textual works
 . abstracts
 . articles
 . bibliographies
 . biographies
 . . autobiographies
 . conference papers
 . correspondence
 . fictional works
 . . dramatic works
 . . poems
 . monographs
 . . manuals
 . . monographic series
 . proceedings
 . reports
 . serial works
 . . journals
 . . magazines
 . . newsletters
 . . newspapers
 . theses