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Topo Sheet Key <br /> This EDR Topo Map Report is based upon the following USGS topographic map sheets. <br /> 1976 Source Sheets <br /> Lathrop <br /> 1976 <br /> 7.5-minute,24000 <br /> Aerial Photo Revised 1976 <br /> 1976, 1978 Source Sheets <br /> Union Island <br /> 1978 <br /> 7.5-minute,24000 <br /> Aerial Photo Revised 1974 <br /> 1968 Source Sheets <br /> Union Island Lathrop <br /> 1968 1968 <br /> 7.5-minute,24000 7.5-minute,24000 <br /> Aerial Photo Revised 1968 Aerial Photo Revised 1968 <br /> 1952 Source Sheets <br /> Lathrop Union Island <br /> 1952 1952 <br /> 7.5-minute,24000 7.5-minute,24000 <br /> Aerial Photo Revised 1949 Aerial Photo Revised 1949 <br /> 5963513 - 1 page 4 <br />