Water softening
By: by L. M. Booth and John H. Smith
Contributors: Smith, John H.; International Correspondence Schools
Edition: 1st. ed.
Publisher: International Textbook Co.
Published: 1924
Place of publication: Scranton, Pa
Language: eng
Other titles: Project method in teaching.
Notes: "Instruction paper with examination questions prepared especially for international correspondence schools."

At head of title : The project method of teaching.