{"type"=>"did", "value"=>"Access to original items restricted. Original in: *LT-7-A 421, *LT-7-A 422, *LT-7-A 423, *LT-7-A 424, *LT-7-A 425."}
{"type"=>"did", "value"=>"Contents: Three against four / Max V. Mathews (1:06) -- Numerology / Mathews (2:17) -- Bicycle built for two / Mathews (1:42) -- Numerology / Mathews (2:28) -- The second law / Mathews (3:17) -- May card / Mathews (1:05) -- Unknown work / Mathews (1:14) -- Miscellaneous selections / Silver Burdett (19:27) -- Sketch I / Otto Luening (9:29) -- Sketches / Otto Luening (9:38) -- Synthetic cannons / Otto Luening (3:30) -- Gargoyles. Synthetic part / Luening (6:58)."}