A Middle Ordovician graptolite fauna from near the contact between Ledbetter Slate and the Metaline Limestone in the Pend Oreille Mine, northeastern Washington State. & Ordovician-Silurian graptolites from the Ledbetter Slate, northeastern Washington State.
1989. US Geological Survey Bulletin 1860, A&B; v+iv, 23+29 pp. 12+12 fig. 1 fold. map in pocket. Orig. wrps. with small libr. stamp, stapled extract, very good, 4to.
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