Station 144b - Engebi, The Aomon Group, and E#- NRLK, AEC approval of the design data was given on October 27, 1950 for this wooden hut used in conjunction with l44a. The building consisted of two rooms - one 10 feet by 10 feet by 8 feet 6 inches high that was Station 144b proper, and one 6 feet 6 inches by 10 feet by 8 feet 6 inches high that was an equip- ment room for the dehumidification equipment. The entire building was sheathed with corrugated aluminum. Station 144b proper was given a vapor seal to help the dehumidification. Station 145, 146 - Engebi, The Aomon Group, and E+- NRLK. On Decem- ber 4, 1950, a sketch was received showing the User's requirements for col- limating towers for Ganex. Two towers were required on each site to support lead shields between station 144a and the zero tower, Three days later, on December 7, 1950, designs and plans were completed for the towers and the material was placed on order. The User furnished the shields and adjusting devices for the shields. All material was erected by H & N under supervision of the User. Stations 160 through 166 inclusive - Engebi; Stations 167 through 174 inclusive ~ The Aomon Group; and Stations 175 through 180 inclusive - Runit- EG&G, These stations were 30 foot telephone poles which carried reflectors furnished by the User. No design was required, and the locations were obtained from the J-Division Instrumentation Chart. stations 190 and 191 - Eniwetok; Station 192 — Rigili —- EG&G. Small photo huts were needed by the User. The least expensive structure that would meet the needs was chosen. This was a wood frame building § feet by 9 feet with a roof sloping from 9 feet above the concrete slab at the front to 8 feet in the back. The sheathing was corrugated aluminun. stations 30la, b, c, e, 1, j, and k ~- Engebi; and Stations 30ld, f, g. and _h - Muzin ~ Military Structures Program. The recorder shelters for the Military Structures Program were originally conceived as small, underground vaults approximately two feet, six inches square, extending approximately two feet, seven inches deep, As time progressed and the program equipment became firm it was evident that a building of substantial size would be required which, in order to avoid distortion of shock and pressure patterns in the vicinity of the structures, would have to be underground, Definitive criteria on sizes of shelters, locations, power requirements, and disposition of equipment were provided on April 5, 1950. Each shelter was divided into two rooms, one for batteries and the other for electrical equipment. Access to the rooms was through the roof via separate square man holes provided with standard man hole covers, The lengths of the rooms varied in accordance with the number of recorders and timing racks located in each station, Thus, the recorder rooms of Stations 30la, d, e, g, and k were 7 feet long; 301b, c, f, and h were 11 feet long; 3014 was 18 feet long; and 301j was 23 feet long. Battery rooms in all stations, other than 301i and J, were 4 feet long. The excepted cases were 6 feet long. Wall thicknesses for the 301 series stations varied from 1 foot, 3 inches down to 8 inches in accordance with the distance of the station from zero, 5-174 Shelves were provided in the battery room, and in the equipmert