Using the Jefferson Nickels as an example to navigate this site —

We have gone through 34,000+ images to sort the Jefferson Nickel DDOs, DDRs and list them. All images have been optimized and made as large as possible within this new format. The Jefferson Nickels are complete with additions and changes and you’ll find 982 searchable entries all accessed from one text box search.

You can search by Date, Mintmark, Date-MM, CONECA Number, Mint location (Denver, Philadelphia, San Francisco), Year + DDO, Year + DDR, Year + RPM, DDO-xxx, DDR-xxx, RPM-xxx, DDO, DDR, RPM, OMM, Die Type (PR, Satin) or any similar combinations of title key words. 

Search examples might be:
Year
Year and MM (example — 1938, 1938-D, 1944-P, 1938-S)
Year and Die Type (example — 1959 PR, 2005 Satin)
Overdate – OMM (example — the Jefferson Nickel 1943-P DDO-003 is also listed as the OMM 3/2 Overdate)
Year and CONECA Number (example — 1938 DDO-001, 1940 RPM-001)
Year, Mintmark and CONECA number (example — 1940-D RPM-001)
Mint Location (example — Denver, Philadelphia, San Francisco)
Mint Location & Year

If you search by year only all varieties for that year will be pulled up
If you search by Mint location only all varieties, from that Mint for all years, will be pulled up
If you search by CONECA number only all years for that number will be pulled up (example DDO-001 for all years)

Each title of the variety links to that varieties main page showing the stages and images of that variety.