Scottish National Dictionary (1700–)
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First published 1941 (SND Vol. II).
This entry has not been updated since then but may contain minor corrections and revisions.
BOOKLAG, n. “A big stone” (Cai.8 1934). Cf. Boucklag.Cai. 1916 An Old Caithness Croft in John o' Groat Jnl. (7 April):
Round the corn yard was a dyke built of “booklags” of stones taken from the land.