Gaertner & Regennas AdvertisementAdvertisement for Gaertner & Regennas in The Journal of Applied Microscopy 1 (1898).Wm. Gaertner & Co. catalog, title pageTitle page, Astronomical Instruments and Accessories [Catalog A from 1908], Wm. Gaertner & Co., Chicago.
Gaertner & Regennas AdvertisementAdvertisement for Gaertner & Regennas in The Journal of Applied Microscopy 1 (1898).
Wm. Gaertner & Co. catalog, title pageTitle page, Astronomical Instruments and Accessories [Catalog A from 1908], Wm. Gaertner & Co., Chicago.
