Nielsen, N. Nurby. <br/><br/>
Tokachi-oki earthquake, Japan, may 16, 1968: a preliminary -report on damage to structures / by N. Norby Nielsen and Ky-oji Nakagawa. 

 - Tokyo, [Japón] : ering 
 - [69] p. 
 - IISEE earthquake report; no. 2 .