Additional information on the author Parkman D. Howe.

Additional information on the author P.M. Handover.

Additional information on the author P.L. Shillingsburg.

Additional information on the author P.L. Heyworth.

Additional information on the author P.J.M. Marks.

Additional information on the author P.J. Weimerskirch.

Additional information on the author P.H.Muir.

Additional information on the author P.H. Muir.

Additional information on the author P.H. Hardacre.

Additional information on the author P.G. Scott.