static L<Web> websMadeByProgram(S progID) {
  new L<Web> webs;
  // TODO: clean up file handle in case of error
  IterableIterator l = scanLog_safeUnstructure_iterator(progID, "webs-made.txt");
  S src = progID;
  for (O o : l) pcall {
    S structure = (S) getOpt(o, 'structure);
    if (structure != null)
      webs.add(web_intern(web_setSourceIfEmpty((Web) unstructure(structure), src)));
  }
  ret webs;
}