1https://digitalarchive.tpl.ca/internal/media/dispatcher/2205173/fullLetter to Robert Baldwin from Lawrence Heyden, June 20, 18401840-06-20Heyden, Lawrence, 1804-18681 sheet, 21 cm x 34 cm folded (4 pages)Manuscripthttps://digitalarchive.tpl.ca/objects/337177/rdf