Columbia subject headings:
Informal sector (Economics)--Egypt--Cairo.
Markets--Egypt--Cairo.
Peddling--Egypt--Cairo.
Harvard subject headings:
Informal sector (Economics)--Egypt--Cairo.
Markets--Egypt--Cairo.
Peddlers and peddling--Egypt--Cairo.
Peddling--Egypt--Cairo.
Princeton subject headings:
Informal sector (Economics)--Egypt--Cairo.