Hi Debbie There are number of good sources. It really depends on where the shells are from. The best sources I know of are for Florida / Caribbean Shells: The Bailey-Matthews Shell Museum Has a CD with region species http://www.shellmuseum.org The Jacksonville Shell Club Has a lot on their web site http://www.jaxshells.org For a good recent book Redfern, Colin 2001 - Bahamian Seashells: A Thousand Species from Abaco Bahamas, BahamianShells.com Inc, 280 pp, bw pl 1-106, col pl 107-124, Soft Bound Hello All! I have been given a number of micro shells from an older collection. They came with partial data cards. I wish to confirm what I have, and update the info. I need a good identification source book. Can any of you recommend one? Thanks, Debbie Englewood, FL.