----------------------------Original message---------------------------- Offer for redistribution: I have some negatives from a photogrammetric stockpile survey that was done for various gas and steam plants of the Philadelphia Electric Company in the early 1950s. There are 11 sheets of 24" x 36" negative stock. The stockpiles (coal?) are mapped with contours and with volume calculations. The stockpiles are named and dated. I'm sure that this could be useful to someone out there -- please let me know if your library can use this in its collections. Susan Greaves Cornell University