[Collection of Four Albums with 254 Original Gelatin Silver Photos of German East Africa (Tanzania and Rwanda), Taken by German Post Inspector Leopold Oehler While in Service in Dar es Salaam; With Oehler’s Large Photograph Portrait, Travel Passport, Two Postal Receipts from Istanbul, a Leaf of Pencil Notes with the Printed Letterhead of “Kaiserlich Deutsches Postamt, Dar-es-Salaam,” and a Notebook with Over 100 pages of Carbon Copies of Oehler’s Letters and Diary Notes Written During his Time in German East Africa].