This series contains correspondence sent by or received by Mary Johnston as well as other administrative and legal documents maintained by her relating to the activities and affairs of the teachers' organizations of which she was a member. These include the Elementary Teachers' Federation of Ontario, The Federation of Women Teachers' Associations of Ontario, the Waterloo County Board of Education, and the Waterloo County Women Teachers' Association.
This series also includes materials maintained by Mary Johnston when she worked for the Waterloo County Women Teachers' Association in various capacitites including Key Teacher, President of Unit 1, as a W.C.W.T.A. Past President, as the association's County Adviser and P.R., and as a member of the Book Project Committee.
Also included in this series is a file containing correspondence sent to parents by Mary Johnston when she worked with the Kindergarten at Brighton School.