4 GHz cryogenic low noise IF amplifiers for OSO imaging receiver.

4 Years Of High Resolution Spectroscopy With Spi/integral.

4-KM Altitude Effects on Performance and Health

4-m off-axis telescope

4-micron Direct Imaging Searches for Planets Around ɛ Eri and V Ind

4.4 b.y.-old clast in Boulder 7, Apollo 17 - A comprehensive chronological study by U-Pb, Rb-Sr and Sm-Nd methods

4.4 Ga Alteration of Chondrules in Allende (CV3) Parent Body: Evidence from the Rb-Sr System

40 Ar- 39 Ar laser probe studies of clinopyroxene inclusions in eclogitic diamonds

40 Ar/ 39 Ar ages and paleomagnetism of São Miguel lavas, Azores

40 Ar/ 39 Ar geochronology of the West Greenland Tertiary volcanic province

40 Ar/ 39 Ar spectrum ages for biotite, hornblende and muscovite in a contact metamorphic zone

40 field red supergiants in the SMC (Meliani+, 1995)

40- to 50-GHz array receiver with tunerless SIS mixers

408-MHz variability study (Riley+ 1998)

40Ar 39Ar dating of detrital muscovite in provenance investigations: a case study from the Adelaide Rift Complex, South Australia

40Ar-39Ar age determinations on the Owyhee basalt of the Columbia Plateau

40Ar-39Ar age of the St. Mary's Islands volcanics, southern India: record of India-Madagascar break-up on the Indian subcontinent

40AR-39AR Ages of Antarctic Meteorites: Y-74191, Y-75258, Y-7308, Y-74450 and ALH-765

40Ar-39Ar Ages of Apollo 16 Impact Melt Rocks by Laser Step Heating

40Ar-39Ar Analyses of Antarctic Dust Particles