Heinle, Dr. K., Spektralphotometrische Farbmessungen in der Philat ... Condition:see description (tbd) contains numerous interesting notes on

contains numerous interesting notes on old German uses

Michel stamp catalogue 'Europe'

otherwise in good condition #36320

Army Construction Office I Frankfurt am Main in Pleskau 10 pages- contribution with illustrations #38843

pages partly stained #38697

Heinle, Dr. K., Spektralphotometrische Farbmessungen in der Philat ... Condition:see description (tbd) contains numerous interesting notes onHeinle, Dr. K., Spectrophotometric color measurements in philately, 1993, introduction to the color measurement method developed by Dr. Heinle, 45 pages, with illustrations, small edition, only published as a special print for the circular 108 of the ArGe Thringen Sa, SBZ OPD edition, very well preserved, signed by the author #46013