The determination of the modal age level for grades four and six of the difficulty of the science principle, "the more rapid the vibrations of a sounding body, the higher is the pitch of the sound it produces."

1955

Lougheed, D. Wayne.

http://hdl.handle.net/2144/11569

Thesis (M.A.)--Boston University

Based on investigation of the BU Libraries' staff, this work is free of known copyright restrictions.