This is just the beginning! Our collection holds over 300 years of history, including rare newspapers, obituaries, marriage records, birth records, and so much more—most of which you won’t find anywhere else!
Key to Plywood Progress Is Field and Lab Research
Field and lab research drives plywood progress says the Douglas Fir Plywood Association DFPA describes how field tests on 48 inch spacing for subfloor and roof decking improve strength and cost. Chief engineer Countryman reports 1 inch plywood is adequate on 48 inch spans and 3/4 inch is suitable for roof sheathing.
MENTIONED IN THIS ARTICLE
Douglas Fir Plywood Association
Annua Nf Taharna
Lares OE Ba Vvapa Vesteve
DFPA
C.c
Minneston Mining and Manufacturing Company
Asbestos-Cement Products Association
David Countryman
Countizcaan
Thomas A. Moran
Technical Department
Micnesota Mining and Manufacturing Company