The link below will take you to the Department of Fisheries and Oceans site, where you can download (PDF) the following research documents:
Catch-at-age of Northwest Atlantic harp seals, 1952-1999.
1999 Pup production of harp seals, Phoca groenlandica, in
Estimating pup production and population size of the northwest Atlantic harp seal (Phoca groenlandica). Healey, B.P., and G.B. Stenson. CSAS Res. Doc. 2000/081.
Recent estimates of reproductive rates for harp seals in the Northwest Atlantic. Sjare, B., G.B. Stenson, and W.G. Warren.