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 chemicaltypecode.txt2017-08-15 11:02 341  
 chemicaltypeid.txt2017-08-15 11:02 339  
 tecode.txt2017-08-15 11:02 285  
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