"Single-course pavement is usually made five inches thick. Proportions for this should be 1:2:3. Concrete for a single course should be mixed to such a consistency that enough mortar will rise to the surface on light tamping to permit of finishing with a wooden float."—The Federal Digest, 1921

One-Course Work

"Single-course pavement is usually made five inches thick. Proportions for this should be 1:2:3. Concrete…

"For two-course floors and pavements, a concrete base of about four inches thick, mixed 1:3:5 (that is, one sack of cement, 3 cubic feet of sand, and 5 cubic feet of gravel), is first placed in the forms."—The Federal Digest, 1921

Two-Course Work

"For two-course floors and pavements, a concrete base of about four inches thick, mixed 1:3:5 (that…

A type of label for plants.

Zinc Tally

A type of label for plants.

A type of label for plants.

Zinc Tally

A type of label for plants.

A type of label for plants.

Zinc Tally

A type of label for plants.

A type of label for plants.

Zinc Tally

A type of label for plants.

A type of label for plants.

Zinc Tally

A type of label for plants.

A type of label for plants.

Zinc Tally

A type of label for plants.