NB
It is now typical to use \epsfig{file=foo,a=b,x=y} instead of \includegraphics[a=b,x=y]{foo}. Nevertheless the original 2001.dvi (.ps) is sufficient to regenerate 2001.pdf with better quality (OCR) text. Under Fedora 28 it is to reproduce with
# .dvi --> .pdf
dvipdf 2001
# .dvi --> .ps and then .pdf with smaller size from ps2pdf
dvips 2001
ps2pdf 2001.ps
# .tex, .bib --> dvi
latex 2001
bibtex 2001
latex 2001
latex 2001
while the much simplified pdflatex
does not recognise figures in PostScript (.ps) format. File epsf.tex
copied here enables the same to be done with Ubuntu 18.04.