Nielsen, N. Norby. <br/><br/>
tokachi-oki earthquake, Japan, May 16, 1968 : a preliminary- report on damage to structures / by N. Norby Nielsen and K-yoji Nakagawa. 

 - Shinjuku-Ku, Japón : IISEE 
 - 66 p. 
 - IISEE Earthquake report ; no. 2 .