----------------------------Original message---------------------------- Greetings again, Several people have contacted me asking for more details on how we managed to display our "mosaic" of USGS 7.5 min topo quads. So for those people and those who are thinking about it, here are a few more tips on doing a similar "mosaic" of map sheets. Brought to my attention by Dale Steele is the fact that the USGS uses a conic (Lambert) projection in some states, and in others (such as Hawaii) a State coordinate system, or the transverse Mercator projection. Our assistants did not run into any major problem that could be attributed to our projection, but this may have been because of the relatively small number of sheets (15) in our map mosaic and the assistants allowing themselves to "fudge" a little bit to fit the map sheet "strips" on top of each other. For those of you contemplating mosaic-ing a large number of conic projection map sheets, the un-squaredness may become more of a concern to you. Caution here. The spray adhesive was of the semi-permanent type. Also availa- ble was a permanent spray. We sprayed the back surface of the encapsulated map and then placed it on the wall. The can suggested that we spray both, wall and item for a more secure hold. Pretty bad fumes. Be sure to do the spraying outside or in well ventilated areas. Have wall marked off so you can more easily throw map on wall after spraying and running in from outside before it dries. Have fun. Aloha, Ross Togashi University of Hawaii at Manoa Hamilton Library - Map Collection email [log in to unmask] mmmmm...distilled monoglycerides