From the totally weird Portraits and posed situations, ca. 1900-1910 collection at the Library of Congress.
Nearly all of these urchins were discovered in the photography archives of the Library of Congress (and available without copyright restrictions online). Otherwise, urchin photos will be credited to the appropriate photographer with a link to its source (unless they come from my own collection of photographs from unknown photographers). If there is ever a copyright concern, do not hesitate to contact me.