If you’re looking for free vintage photos from public archives that have no copyright restrictions (according to the site, “at the very least avaialble for personal and noncommercial use”), check the New Old Stock website. Curated photo packs are available at a cost.

Use the search function (hidden in the top left corner of the site) to find topical photographs. The site appears to have very appealing but very few black-and-white photos: My search for “factory” brought up 14 photos, “horse” turned up 11 photos.