In my "Library"; besides the different specific Oil Company Collector's Guides.
I also have "American Oil Cans" Vol 1 by Tom and Susan Allen. "Collecting Oil Cans" and "More Oil Cans" both by W.Clark Miller and Sabra Sonewald...
Plus, A number of years worth of issues: Of PCM (Petroleum Collectibles Magazine), CTO (Check The Oil Magazine) and Tiger Hightest Magazine...
The Oil Can Guides do give a general idea of when a can was produced and used... The Magazines at times also give dates, but IMO, they offer more of a "general History" behind the Oil Company's that used the cans, which I find more enlightening...