Ground-water papers for a meeting of the International Union of Geodesy and Geophysics, Toronto, Canada, September 3-14, 1957. UNITED STATES DEPARTMENT OF THE INTERIOR GEOLOGICAL SURVEY Water Resources Division Washington 25, D.C. In reply refer to: March 20, 1957 Code 4051 0001 GROUND WATER BRANCH MEMORANDUM NO. 57.30 To: District Chiefs and Staff Officials, Ground Water Branch From: Chief, Ground Water Branch, Washington, D.C. Subject: Ground-water papers for a meeting of the International Union of Geodesy and Geophysics, Toronto, Canada, September 3-14, 1957. Recently, it was called to my attention that only three ground- water papers, all of which are by authors outside the Survey, have been offered for the International meeting in Toronto next September. In view of the splendid record which the Ground Water Branch has had in participating in the international meeting of the International Union of Geodesy and Geophysics, we have been reminded that it would be most unfortunate if we did not present a few papers at the Toronto meeting. Although there is little time to obtain papers, I am hoping that at lease a few of you will find that you have papers which can be made available, so that the abstracts can be submitted by April 10 and the papers by May 1. There is hardly time to prepare new papers, but I believe that some of you have papers which have been approved for publication, and which relate to one of the following subjects which are to be discussed at Toronto: 1. Methods used in production of hydrogeologic maps, showing the occurrence, quantity, and quality of ground water. 2. Outlines of methods for estimating ground-water resources (excluding geophysical methods). 3. Contamination of ground water by saline water, industrial wastes, mine or oil-well waters, etc. 4. Methods of using radioactive and other tracers to determine direction and rate of movement of ground water. 5. The role of vegetation and cultivation of a catchment in the hydrologic cycle. The last subject will be discussed at a joint meeting of the Surface Waters, Subterranean Waters, and Land Erosion Commissions. It will be appreciated if each of you will let me know promptly by air mail what papers on the above subjects can be made available from your district. As soon as that information is received in this office we will select the papers that seem to be the most appropriate and notify the authors, so that they will transmit an abstract (4 copies) of not more than 250 words to this office before April 10, and will make certain to get the paper into this office by May 1. If abstracts and papers not yet approved in the Director's office for publication are submitted, they of course should be sent early enough so that there will be a reasonable chance of getting approval in the Director's office before the deadline. Papers already approved for publication of course will not have to be submitted to the Director's office for approval. The papers should not exceed 20 typed pages, each of 360 words, with double spacing between the lines. This over-all length should include all illustrations and tables. Where illustrations are required original tracings should be sent. Your prompt attention to this request will be appreciated very much. (s) A. N. Sayre Distribution: A, B, GS, GFO