Acoustic properties of headgear.  X:  RCAF prototype helmet-earmuff devices
By: G. D. Thrasher and Keith K. Neely.
Contributors: Neely, Keith K.; Defence Research Medical Laboratories (Canada)
Series: Defence Research Medical Laboratories.  Technical memorandum -- no. 100-11
Publisher: Canada, Dept. of National Defence, Defence Research Board, Defence Research Medical Laboratories
Published: 1960
Place of publication: Toronto
Notes: Bibliographical references: p. 2-3.