Figs. 1 and 2-The blocks are laid on a thin layer of cement mortar. The tongues and grooves of the blocks enable them to be interlocked.
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https://paperspast.natlib.govt.nz/periodicals/NZJAG19491115.2.26.16
Bibliographic details
New Zealand Journal of Agriculture, Volume 79, Issue 5, 15 November 1949, Page 480
Word Count
26Figs. 1 and 2-The blocks are laid on a thin layer of cement mortar. The tongues and grooves of the blocks enable them to be interlocked. New Zealand Journal of Agriculture, Volume 79, Issue 5, 15 November 1949, Page 480
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