Maybe you need to brush up on your Google-Fu.
I do agree with having physical refs that you can pin up all over the place, I usually take all the stuff I found on Google and print it out so I can do exactly that. On the other hand, maintaining a swipe file that's large enough to be useful takes up gobs of space, so if you're in, say, a typical New York size working space, it gets problematic.
And I've found Google invaluable for finding extremely specific and/or obscure items that I wouldn't have had in my ref books or swipe files anyway - like a New York taxi cab from between the years 1934 and 1936.
I still like reference books better than Google, though... It's easier to flip through and find something because I already know my book collection, and I get a print resolution ref, and textual info to go with it. I tend to collect reference books on subjects that I refer to frequently (historical costume, animals, plants, architecture, vehicles, etc.) So often I can find what I need by hitting the books. And for weird stuff, there's Google.
My usual procedure for drawing anything is usually something like:
1: Can I make it up? If not...
2: Can I wrangle a live reference easily in time? If not...
3: Are there any useful images in my reference books? If not...
4: Time for a little Google-Fu!
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