Bibliographic record
Darrah, William C., 1969.A critical review of the upper Pennsylvanian floras of eastern United States with notes on the Mazon Creek flora of Illinois. Privately published. Gettysburg, Pennsylvania. 220 p. (Actual publication date, 1970).
Specimens figured in this publication:
14242,
14248,
14262,
14483,
14522,
14758,
14759,
14950,
14967,
15195,
15204,
15257,
15307,
15722,
15899,
1622,
1623,
1624,
1625,
1625a,
1625b,
1625c,
1628,
1628a,
1628b,
1640,
1664,
1685,
1725,
1754,
1790,