Name	Last modified	Size	Description
	Parent Directory		-
	ip1960.sas	2002-02-22 15:40	6.7K
	ip1970.sas	2002-02-22 15:36	9.7K
	ip1980.sas	2002-02-22 15:12	10K
	ip1990.sas	2002-02-22 15:08	9.2K

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