Stamp Auction Catelogs

I have A LOT of these, from the 30's to the late 60's...Rarities of the World, Newbury Collection, Colonel Green Collection, Alfred Caspary Collection, Frank Hollowbush Estate, Roberto Larranga Collection, Leavitt Bulkley Collection, Frederic Grant Collection, George Hale Collection, Hans Kropf Collection, Arthur Linz Collection, W. Gerrish Collection...few more. Most are Siegel, some Fox, some Mercury, some Laurence & Stryker auction houses. These worth anything of decent value ?

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Since they are nearby ...

http://www.rmpldenver.com/ ... Rocky Mountain Philatelic Library in Denver

I used to be a member of the Rocky Mountain Philatelic Library. Been there many times.

To get an idea:
http://www.pbbooks.com/index.htm