Series consists of copies of Echoes, a publication produced at Peterborough Collegiate and Vocational Institute. Early editions were published monthly by various groups, including the Philomathean Society and the Literary Society. Later volumes are published yearly and function as yearbooks. 1977 was the sesquicentennial of P.C.V.I. and the yearbook for this year has a full history of the school included.
Years include 1905, 1907-1910, 1916-1918, 1922, 1925-1927, 1929, 1937-1944, 1946-1965, and 1977.