Report to congress : preventive health and health services block grant.

Shipping list no.: 91-229-P.

Report to congress : preventive health and health services block grant.

Shipping list no.: 91-229-P.

Cellular-block-lined grade control structure : hydraulic model investigation /

"August 1973."

Concrete-block manufacture ; processes and machines,

Mode of access: Internet.

Practical concrete-block making; a simple practical treatise for the workman explaining the selection of the materials and the making of substantial concrete blocks and cement brick, together with directions for making molds and remarks on how to obtain the best architectural effects,

Mode of access: Internet.