Muller lecture: Puzzles in rock

Einstein, H. H. / Meyer, T. / International Society for Rock Mechanics | British Library Conference Proceedings | 1999

Foundry puzzles and their solution

Horner, J.G. | Engineering Index Backfile | 1919

Book Review: At Work With Human Puzzles

Griffith, Doug | Online Contents | 2012

Puzzles: Wooden puzzles are not only challenging and fun, they can also make great bandsaw projects. Here are are a couple of variations

British Library Online Contents | 2003

Pieces that fit some puzzles about Legionnaires' Disease outbreaks

Broadbent, C. R. / Bentham, R. H. / Marwood, L. N. et al. | British Library Conference Proceedings | 1995