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<br />F. When a published map is a considerable enlargement of a map draw- <br />ing (manuscript) or of a published map, that fact shall be stated in <br />the legend. For example, "This map is an enlargement of a 1 :20,000- <br />scale map drawing," or "This map is an enlargement of a 1 :24,000- <br />scale published map." <br /> <br />G. To facilitate ready interchange and use of basic information for map <br />construction among all Federal mapmaking agencies, manuscript <br />maps and published maps, wherever economically feasible and con- <br />sistent with the uses to which the map is to be put, shall conform to <br />latitude and longitude boundaries, being 15 minutes of latitude and <br />longitude, or 7.5 minutes, or 3-3/4 minutes in size. <br /> <br />U. S. BUREAU OFTHE BUDGET <br /> <br />Issued June 10, 1941 <br />Revised April 26, 1943 <br />Revised June 17, 1947 <br /> <br />Note: Maps when used in the form of the normally-clistributed paper <br />prints do not generally retain the inherent accuracy of the map. <br />This can be attributed to changes in the hygrometric conditions <br />of the atmosphere and to the normal distortions associated with <br />handling. When the subject maps are to be used for work requiring <br />the orig['lal, inherent accuracy, map users are advised to request <br />scale-stable base material maps. <br /> <br />" <br /> <br />