Concrete core test 1927-1977 with addendum for 1978-1989 an-notated / compiled by V. Rama Krishnan for ACI Committe 21-4 Evaluation of results of tests used to determine the stre-ngth of concrete. 

 - Detroit, Mich. : American Concrete Institute 
 - 42 p. 
 - ACI Bibliography no. 13 .