| Item Description: | 1. Issued in pockets of text. Quadrangles cover l p0 sof latitude by 1.5 p0 sof longitude. Coordinated for use with sheets published by various state and territorial governments as "contributions" to the 1:250,000 series, each with individual title. Margins include colored geological cross sections, diagrammatic relationship of rock units, geological reliability diagrams, indexes to adjoining sheets, and sheet location diagrams. Cartographic material. |
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| Physical Description: | color maps ; 48 x 68 folded to 20 x 14 cm. |