Name	Last modified	Size	Description
	Parent Directory		-
	costs.txt	2018-09-06 17:36	336
	fyb.txt	2018-09-06 17:36	334
	fye.txt	2018-09-06 17:36	334
	ip_charges.txt	2018-09-06 17:36	341
	op_charges.txt	2018-09-06 17:36	341

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