image usgs_drg_co_39106_d1 Colorado 39.375N 106.000W Breckenridge o 2.43840000 0.00000000 0.00000000 -2.43840000 402310.29650808 4373433.73118571 D1 1968 1987 2006-10-10 USGS DRG o map of Colorado 39.375N 106.000W D1 Breckenridge maps_usgs usgs_co jared@redjar.org 1987-01-01 2006-10-10