[Records, (1890s-1940s), chiefly ledgers, of the Ilford company and of several smaller photographic manufacturers which joined the Ilford group, including Ilford Ltd., the Imperial Dry Plate Co., the Gem Dry Plate Co., the APM and APEM group of companies, the Paget Prize Plate Co. Ltd., Wellington & Ward Ltd., Thomas Illingworth & Co. Ltd., Baryta Ltd., the Veracol Film Syndicate, and Fluorescent Materials Ltd.. Partial listing available]