D.P.H. Hasselman ... [et al.]. Mark Kesselman ... [et al.] P.R. Elseman ... [et al.] Gerd Hanselmann ... [et al.]. D.L. Spellman ...[et al.] Ruth Wageman ...[et al. William N. Zelman ... [et al.]. Erik Dahlman ... [et al.]. Joan Kimmelman ... [et al.]. by D.P.H. Hasselman et al...