KidwellPeggy Aldrich

The Adding Machine Fraternity at St. Louis

KidwellPeggy Aldrich, 2000 .

'Yours for Improvement'-The Adding Machines of Chicago, 1884-1930

KidwellPeggy Aldrich, 2001 .

Stalking the Elusive Computer Bug

KidwellPeggy Aldrich, 1998 .