----------------------------Original message---------------------------- Folks, Well, it could only happen on Leap Day. There I was, blithely checking in the new USGS reports, when I came across Professional Paper 1409-D. I whipped out my check-in card-- but I already **Had** a 1409-D. Yikes! Was that a prior check-in error or a 2nd copy? I ran to the shelf, to check-- and I already had a copy. But wait-- they didn't look identical: one was fatter. So I checked more closely..... Oh, no... Same number. Same title. Different authors. Different years. Ack--- Different text. But-- there's no obvious note that the later one is a revision. I quickly called Linda Newman. Her copy hadn't gotten to her yet, so she hadn't seen this. She suggested that we change the numbers to 1409-D-1991 and 1409-D-1995. This is quite a boo-boo. Gonna be a real mess when a library user asks for PP 1409-D, or we try to cite it. With luck, though, we won't have another error this bad until the next Leap Day-- in 2004. Let's hope... -- Connie Manson