Into what river does this stream flow?

The End Well, maybe not the end, but two years after the beginning, an end... We went from Maine to Mars to a meteor... Brief explanation: About ten years ago my great uncle Spike gave me a few boxes of lantern slides. Most of them were in terrible condition. Some of them were from the NYC Department of Education. Although lantern slides are not uncommon, perhaps an almost complete set with the explanatory text is not too common... We thought it might be interesting, edifying, and/or slightly fun to post them daily and make a corresponding Google map... We  have many more lantern slides, although not a set with corresponding explanatory text, in the future we'll clean and digitize and probably post them. (Large greyscale images, with text, can be seen on a few university websites, see below, and of course clicking on "Archive" displays all the posts.) A few quotes, references and links:

Internet Archive: VISUAL EDUCATION TEACHERS' GUIDE TO KEYSTONE "6OO SET" Google books: Teachers' Guide for the Use of the "600 Set" of Keystone Stereographs and Lantern Slides, by Douglas Clay Ridgley.

Radford University Digital Collections (Large greyscale image files and text: ) Indiana University (link may not work): "The Keystone View Company was founded in 1892 by Benneville Lloyd Singley (d. 1938) in Meadville, PA. Singley was a former Underwood & Underwood salesman and an amateur photographer. Singley began by selling stereocards that depicted the flooding of the nearby French Creek. His company grew to become the major distributor of stereographic images. By 1905, Keystone was the largest stereographic company in the world, specializing in national and international geographic and social science images. While the company’s images were popular forms of entertainment at first, television and film challenged that status during the early twentieth century, which caused Keystone to shift focus from entertainment to education. At that time, Underwood & Underwood had pioneered the field of educational stereoviews and lantern slide sales to schools, and the two companies competed for business. However, Keystone practiced a more aggressive sales method and more progressive editorial policies, which soon made them the acknowledged leader in the industry. All of Keystone's manufacturing was done in Meadville, but branch offices were located in New York, St. Louis, San Francisco, Portland, Oregon, Chicago, Toronto, Canada and London, England. In 1963, Keystone’s education and stereoview departments were closed, and the company was bought by Mast Development Company. Keystone continued to manufacture eye training stereographic products as a subsidiary of Mast. In 1972, Mast closed the Meadville manufacturing site. In 1978, Keystone’s records and inventory of negatives were given to the University of California Riverside." Of course the George Eastman House has amazing lantern slides, (some in color!): geh.org geh.org geh.org Also from GEH: "The Keystone View Company began as a rather modest operation in Meadville, PA in 1892. The company expanded its operations rapidly, and began to employ teams of photographers who were sent to locations around the world. By 1900, the company offered over 8,000 different stereo views as well as lantern slides, and by 1940, the list had grown to more than 40,000 titles. Door-to-door salesmen promoted the product (both stereo views and lantern slides) to individuals, as well as educational institutions. These included views illustrating history, science, and especially geography. From its Meadville beginnings, the company grew to include branch offices in many countries, the largest being the London office. For further information about the Keystone View Co., see William C. Darrah, The World Of Stereographs, 1977."

Thank you to everyone who has followed along (especially Krippner :-). And thank you Spike.