1. a Consulting Geologist , P. O. Box 31036, 725 College Street, Toronto, Ontario M6G 4A7, Canada and Nicabox 1330, 7801 NW 37th Street, Miami, Florida, 33166-6559
2. b Ministry of Promotion, Industry, and Commerce, National Administration of Geologic Resources, del Sandy's , Carretera Masaya, 1, cuadra arriba, Managua, Nicaragua