by Dr. Al. Purwa Hadiwardoyo, MSF. $4.00
by David Campbell, Ph.D $5.00
by ISEI $13.00
by Dr. Ir. Muhammad Rasyaf, MS $7.00
by Paul J. Centi $5.00
by Th. Aq. M. Rochadi Widagdo, Pr. $6.00