Additional information
Documents listed are available from ERIC Document Reproduction Service, P.O. Drawer O, Bethesda, Md. 20014, unless otherwise noted, and can be purchased for the stated price. There is no longer any service charge added on to the price.It is vital that the document be identified by its ED number.
Rights and permissions
About this article
Cite this article
Coombs, D.H. Research abstracts. ECTJ 19, 482–487 (1971). https://doi.org/10.1007/BF02768371
Issue Date:
DOI: https://doi.org/10.1007/BF02768371