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 cc.txt2016-01-12 19:52 3.7K 
 icd.txt2016-01-12 19:52 141K 
 icdvers.txt2016-01-12 19:52 345  
 modtype.txt2016-01-12 19:52 345  
 modvers.txt2016-01-12 19:52 359  
 year.txt2016-01-12 19:52 342  
Apache/2.4.53 (FreeBSD) OpenSSL/1.1.1t-freebsd mod_apreq2-20090110/2.8.0 mod_perl/2.0.12 Perl/v5.34.3 Server at data.nber.org Port 443