/cgi-bin/koha/opac-search.pl?q=ccl=au%3A%22Swartz%2C%20Frank%20M.%22&sort_by=relevance&format=rss 2 0 50 ISBN: /cgi-bin/koha/opac-detail.pl?biblionumber=26880 By Swartz, Frank M..
State College, Pa., School of mineral industries, 1929 .
1 p. l., 14, [13] p. , [pt. 1] "reprinted from the Proceedings of the Pennsylvania academy of science, v. 3, 1929." 23 cm..

]]> Place hold on The Helderberg group from central Pennsylvania to southwestern Virginia,

]]> /cgi-bin/koha/opac-detail.pl?biblionumber=26880 ISBN: /cgi-bin/koha/opac-detail.pl?biblionumber=27585 By Pennsylvania..
Harrisburg, Pa. : Dept. of internatl affairs, Topographic and geologic survey, 1939 .
xii, 481 p. : , At head of title: Pennsylvania Geological Survey, Fourth series. 24 cm..

]]> Place hold on The Devonian of Pennsylvania :

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