(Table 1) Crystal sizes of measured samples from the Bush Hill region in the Gulf of Mexico and from ODP Leg 204 at the Hydrate Ridge offshore Oregon

The grain sizes of gas hydrate crystallites are largely unknown in natural samples. Single grains are hardly detectable with electron or optical microscopy. For the first time, we have used high-energy synchrotron diffraction to determine grain sizes of six natural gas hydrates retrieved from the Bush Hill region in the Gulf of Mexico and from ODP Leg 204 at the Hydrate Ridge offshore Oregon from varying depth between 1 and 101 metres below seafloor. High-energy synchrotron radiation provides high photon fluxes as well as high penetration depth and thus allows for investigation of bulk sediment samples. Gas hydrate grain sizes were measured at the Beam Line BW 5 at the HASYLAB/Hamburg. A 'moving area detector method', originally developed for material science applications, was used to obtain both spatial and orientation information about gas hydrate grains within the sample. The gas hydrate crystal sizes appeared to be (log-)normally distributed in the natural samples. All mean grain sizes lay in the range from 300 to 600 µm with a tendency for bigger grains to occur in greater depth. Laboratory-produced methane hydrate, aged for 3 weeks, showed half a log-normal curve with a mean grain size value of c. 40 µm. The grains appeared to be globular shaped.

Study of the effects of applying federal motor vehicle safety standards 203 & 204 to light trucks and vans. Modification No. 3. Final report.

National Highway Traffic Safety Administration, Washington, D.C.

An evaluation of Federal Motor Vehicle Safety Standards for passenger car steering assemblies. Standard 203 - impact protection for the driver. Standard 204 - rearward column displacement.

Mode of access: Internet.

Rigaudon : op. 204 /

"Op. 204, no. 3"--Cover.

Cost evaluation for three Federal Motor Vehicle Safety Standards - FMVSS 203, 204, and 212. Final report.

National Highway Traffic Safety Administration, Washington, D.C.

Report of Apollo 204 Review Board to the Administrator, National Aeronautics and Space Administration.

Report -- Appendix A. Board minutes -- App. B. Witness statements & releases -- App. C. Apollo operations handbook -- App. D. Panel reports -- App. E. Management and organization -- App. F. Schedule of physical evidence -- App. G. Addenda and corrigenda.

Title 41, Pt. 50-204, Section II. Radiation safety and health standards for Federal supply contracts, under the Walsh-Healey Public Contracts Act.

Mode of access: Internet.

Report for Alaska land withdrawals : section 204(c) of FLPMA (P.L. 94-579) /

Spine title: Alaska 204(c) land withdrawals.

Cost evaluation for three federal motor vehicle standards, FMVSS 203, 204, and 212 /

Mode of access: Internet.

Direct support, and general support, maintenance repair parts and special tools list : shop equipment, general purpose repair, semitrailer mounted (southwest truck body model SGPRSMD) (serial no. Range S-11-204 through S-11-265) (4940-01-006-3229).

"May 1982."