-----Original Message----- From:Francis Herbert Sent:08 January 200317:32 To:[log in to unmask] Subject: USGS 1:250K series V502 printings A recent donation has brought me a problem regarding some sheets of above topo series. Sheets NI 11-3 (1972), 11-5 (1975), 12-1 (1972), and NJ 12-11 (1973) in the present instance we now have here each in two printings of identical rev./ed. date(s) and identical publication date - but one printed version of each has yellow infill for urban areas, the other printed version has infill in grey. Which version was printed before/after the other? The addition of an edition statement above top border, and/or the addition of a stock number outside bottom right border, is no consistent chronological guide regarding these sheets. As our limited reference materials are inaccessible at present (for about another year - but at least there's a large hole in our Garden ready for excavation, etc.) and as there's a distinct probability the USGS website would be impenetrable over this problem, I am asking those directly who know the answer from practical (everyday?) experience. PS: the absence or presence of the green 'Woods-brushwood' overprint is less of a problem (and doesn't apply to the 4 sheets in this query). Yours in hope Francis Herbert (Curator of Maps, RGS-IBG) [log in to unmask] http://www.rgs.org [see 'Collections'/'Unlocking the Archives']