HP-41 Book "Programming the HP 41C/CV/CX" by Thomas Adams

[telemachos]

Abebooks is a meta-site: it offers individual booksellers a place to list books for sale.

Used.addall.com, on the other hand, could be called a meta-meta-site: it searches the listings compiled by Abebooks and other meta-sites, among which are Amazon and Biblio.

Used.addall.com does not find any copies of Thomas Adams's HP-41 book.

But consider these results of searches for Adams's "Mastering the HP 48G-Gx": Abebooks finds two sellers of the book, and Used.addall.com has 12 hits (two of which are the Abebooks hits). The 10 other hits are listings from Alibris, Amazon, AmazonCA, AmazonDE, AmazonFR, Biblio, and Biblio.co.UK.

Listings on Used.addall.com are not as thorough, nor as beautiful, as those on Abebooks. But if I want to find a book, my go-to site is always Used.addall.com.