Be$t fo*Builder and.Buyer

2 ro I Norion-Wide Prebrence for R.O.Ws is indicated by available building reports. Both builder and buyer select them for fine construction. . longlasting beauty exclusive removable feature. They cost no more than ordinary windows.

New Book lists lO27 U. S. Trees

As an aid to foresters. botanists. students and other people interested in trees, the U.S. Department has issued a check list of trees of the United States and Alaska. The list, a book of 450 pages, covering 1027 trees, is Agriculture Handbook No. 41. A copy may be obtained from the Superintendent of Documents, Government Printing Office, Washington 25, D.C., for $2.00.

The list, compiled by Elbert L. Little, Jr., of the Forest Service, under direction of the Forest Service Tree and Large Plant Name Committee, gives the accepted scientific names, their etymology, current synonyms, approved common names, other common names, range of native and naturalized American trees, bibliograpiric citations, and other information. Conforming to the International Rules of Botanical Nomenclature, the list aims to encourage uniform usage of names for trees.

The book is confined to trees which for the purpose of listing are defined as woody plants with a single erect stem or trunk, 3 inches or more in diameter at 4l feet above the ground and at least 12 f.eet high. Also iarge willow trees I'r'ith several trunks springing from the same root and other similar trees are included in the list.

This is the third official tree list of the Forest Service. It supersedes and is a thorough and complete revision of Miscellaneous Circular 92, a check lidt compile d in 1927 which is out of print and which used the now obsolete American Code of Nomenclature.

Billy Grohqm's Huge New Wooden Tqbernqcle

R.O.Ws Lih Ovt Complaely... from inside the house . for cleaning, painting or glass replacement. Because of this exclusive feature, more than 7,000,000 are now in use. Homes with R.O.Ws sell faster in today's selective market.

Evangelist Billy Graham built what he called his "Crusade Auditorium" this past fall at Detroit, Michigan, to house a tremendous religious crusade. It is one of the largest r-,'ooden structures built in modern times. It is located on the Michigan State Fair grounds, seats 12.000 people, covers one and three-quarters acres of ground, is.240 by 318 feet in dimensions, and is practically free from upright obstructions due to its wooden arch truss construction. It was built in just 5 weeks time.

The trusses were built from glued, laminated lumber, and there are 45 feet of these trusses each spanning 80 feet. TECO, research affiliate of the National Lumber I\Ianufacturers Association, is the author of this engineering triumph. The different parts are put together with wedge-fit, split-ring connectors, a TECO device.

This auditorium is a modern marvel.