Pergamon Press,

Lawyers Cooperative Publishing,

Argonne National Laboratory ; Available to the public from the National Technical Information Service,

Routledge ; American Educational Research Association,

Dept. of Agriculture, Science and Education Administration : for sale by the Supt. of Docs., U.S. Govt. Print. Off.,

U.S. Dept. of Education, Office of Educational Research and Improvement, Educational Resources Information Center,

Macmillan Library Reference USA,

The Office,

The Endowment,

McGraw-Hill College,

Picton Press,

Genealogical Pub. Co.,