Map of glacial limits and possible refugia in the southern Alexander Archipelago, Alaska, during the late Wisconsin glaciation

Online link https://geo-nsdi.er.usgs.gov/metadata/map-mf/2424/metadata.faq.html
Description During the late Wisconsin glaciation (circa 26,000-13,000 carbon-14 yr BP) the Cordilleran glacier complex formed vast ice fields and large glaciers along the crest of the Coast Mountains. As these glaciers flowed west to the Pacific Ocean, they were joi
Originators Carrara, Paul E.; Ager, Thomas A.; Baichtal, J. F.; and Van Sistine, Darren R.
Publication U.S. Geological Survey Miscellaneous Field Studies Map MF-2424

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Overview of attributes

The dataset consists of three coverages:
>EXTENTS (probable Cordilleran ice extents)
>100M_CONT (bathymetric contours below -300 meters)
>25M_CONT (bathymetric contours above -300 meters)
>
>
><EXTENTS.AAT>
>item explanation:
>DESCRIPTION--short description of line feature
>
>COLUMN   ITEM NAME      WIDTH   OUTPUT   TYPE   N.DEC
>1        FNODE#             4        5      B       -
>5        TNODE#             4        5      B       -
>9        LPOLY#             4        5      B       -
>13       RPOLY#             4        5      B       -
>17       LENGTH             4       12      F       3
>21       EXTENTS#           4        5      B       -
>25       EXTENTS-ID         4        5      B       -
>29       DESCRIPTION      100      100      C       -
>
>DESCRIPTION
>Chatham Strait fault
>Fairweather/Queen Charlotte fault
>probable late Wisconsin Cordilleran ice marginal position
>probable pre-late Wisconsin Cordilleran ice marginal position
>submarine slide scarp
>
>
><100M_CONT.AAT>
>item explanation:
>CONTOUR--bathymetric contour interval, in meters below sea level
>(100-meter increments)
>
>COLUMN   ITEM NAME      WIDTH   OUTPUT   TYPE   N.DEC
>1        FNODE#             4        5      B       -
>5        TNODE#             4        5      B       -
>9        LPOLY#             4        5      B       -
>13       RPOLY#             4        5      B       -
>17       LENGTH             4       12      F       3
>21       100M_CONT#         4        5      B       -
>25       100M_CONT-ID       4        5      B       -
>29       CONTOUR            8       14      F       0
>
>CONTOUR
>values between -300 and -3100 (100-meter increments)
>
>
><25M_CONT.AAT>
>item explanation:
>CONTOUR - bathymetric contour interval, in meters below sea level (25-meter increments)
>
>COLUMN   ITEM NAME      WIDTH   OUTPUT   TYPE   N.DEC
>1        FNODE#             4        5      B       -
>5        TNODE#             4        5      B       -
>9        LPOLY#             4        5      B       -
>13       RPOLY#             4        5      B       -
>17       LENGTH             4       12      F       3
>21       25M_CONT#          4        5      B       -
>25       25M_CONT-ID        4        5      B       -
>29       CONTOUR            8       14      F       0
>
>CONTOUR
>values between 0 and -275 (25-meter increments)

http://pubs.usgs.gov/mf/2003/mf-2424/mf-2424_508.pdf