Muriel has provided you with all the info avail. on BSQ-D for Eliza Maud Mary Semmens.
For Lilian Mary Johnston, this is probably the best fit:
Lilus Johnston born 30 Apr 1911, died 14 Nov 1991, widow, 80, d.o. John Johnston and L. Miller,husband (no given name) Murdoch, resided at St-Bruno de Montarville at the time of her death.This is about 20 miles SE of Montréal.