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The carbohydrate contents of the maple tree
A new maple product
The exclusion of lead from maple sap : progress report
Some factors affecting the yield from maple tapholes
Maple sugar
Buddy sap
Economics of the farm manufacture of maple syrup and sugar
Variation in sugar content of maple sap
The maple sap flow
The maple sap flow : (Popular edition of no. 103)
Marketing Vermont's maple syrup
The bounty on maple sugar
Porter Thayer's Daybook, cover and two pages
Economics of the farm manufacture of maple syrup and sugar
Pumping maple sap from the bucket to the gathering tank
Site-index curves for even-aged northern hardwoods in the Green Mountains of Vermont
Maple marketing in department stores : (a sales test)
The grazing of maple sugar orchards
The results of the bounty on maple sugar
Marketing Vermont maple-sap products
Photographer Thayer Marks 90th Birthday
Vermont Life article about Porter Thayer's images
Using water pumps for gathering maple sap