V. Gordon Childe 
Scotland Before the Scots [PDF ebook] 
Being the Rhind Lectures for 1944

Originally published in 1946, this book presents in what can arguably be described as an unusual way, a slice of Scottish social life by applying to prehistory the principles of Marxism as practised by Soviet scholars of Russian prehistory. Using archaeological evidence, the author distinguishes 6 stages – from the earliest definable groups of immigrants to the Iron Age. There are 10 appendices, devoted to the typology and classification of tombs, pottery, implements and fortifications.