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Mortar. Although mortar that dries whilst packing around stonework will adhere the stones to form a structure.
65 BLOCKS PER 74 POUND OF MORTAR (THAT YOU ADD SAND TO) 80 POUND PREMIX MORTAR JUST ADD WATER 27 BLOCK 8X8X16
a mortar set
$834 USD in 1945
Some of the examples of mortar are,