Bergbuchlein: "A well-planned, useful little book on how to prospect for and find the ores of the different metals, with illustrations of the lay of the terrain and an appendix of mining terms, which will prove most useful to young miners."
Printed at Worms, MDXVIII. Published anonymously, but Agricola considered Calbus of Freiberg [Ulrich Rülein von Kalbe] to be the author. Framed by a conversation between Knappius, a miner, & Daniel.

Probierbuchlein: "A little book on the assaying of gold, silver, copper, and lead. Also on how to assay and work profitably all kinds of metal. Compiled with great care for the benefit of all mintmasters, assay masters, goldsmiths, miners, and dealers in metals."

From the .Introduction: "The Bergbüchlein and Probierbüchlein occupy a unique position in the literature of mining and metallurgy, for they are the first printed books on any aspects of the two related professions."