Author:

Richardson,J.B.;McGregor,D.C.

Year:

1986

Title:

Silurian and Devonian spore zones of the Old Red Sandstone continent and adjacent regions.

Reference:

Richardson,J.B. et al. (1986) Silurian and Devonian spore zones of the Old Red Sandstone continent and adjacent regions. Geological Survey of Canada, Bulletin # 364 P. 1- 79

Google Academy:

try to search by title in english