Letter from J. C Perry & Co., Sole Travelling and Advertising Agents of Carl L. Jensen’s Preparations, recently found by me stuck between pages in an old book.
Ads for the Crystal Pepsin can be found here in the Dietetic and Hygienic Gazette, Volume 6, Issue 8, October 1890 and here in the The National Druggist, Volume 12, Issue 8, April 15, 1888. Many other great ads can be found by scrolling through these two links.
