Dear Colleagues, I would like to draw your attention to the following paper, published in the *September* edition of the Journal of the Acoustical Society of America: Vol 118, No.3, Pt.1 pp.1830-1837 *Types, distribution, and seasonal occurrence of sounds attributed to Bryde's whales (/Balaenoptera edeni)/ recorded in the eastern tropical Pacific, 1999-2001* Sara L. Heimlich(1), David K. Mellinger(1), Sharon L. Nieukirk(1), Christopher G. Fox(2) / (1) Cooperative Institute for Marine Resources Studies, Oregon State University, and NOAA Pacific Marine Environmental Laboratory, 2030 SE Marine Science Drive, Newport, Oregon 97365/ /(2) National Geophysical Data Center, National Oceanographic and Atmospheric Administration, 325 Broadway, E/GC, Boulder, Colorado 80305-3328/ *Abstract* Vocalizations resembling known Bryde's whale sounds were recorded on autonomous hydrophones at seven sites in the eastern tropical Pacific. Five short (<3 s) low-frequency (<80 Hz ) "phrase" types were observed. "Swept alternating tonal" phrases included a 37 Hz tone and often a 25-16 Hz downswept tone, while "non-swept alternating tonal" phrases had a predominant tone at 29 Hz and often additional tones at 16 Hz and 47 Hz. Alternating tonal phrases were found in 79% of the total hours in which phrases were detected, and occurred primarily at the eastern hydrophone sites/. / "Burst-tonal" phrases included tones that were often preceded by a wide-band burst of noise. The "low burst-tonal" phrase contained tones at 19 Hz and 30 Hz, and was detected at five of the hydrophone sites. The "high burst-tonal" phrase included a 42 Hz tone and was observed only on the northwestern hydrophones. A single "harmonic tone" phrase type was observed that included a fundamental tone at 26 Hz and at least two harmonics; this phrase was observed exclusively at the eastern hydrophone stations. This opportunistic survey has shown that acoustics is an effective means of studying this poorly understood, pelagic balaenopterid. *ERRATA: Page 1834, Section C. Geographic and seasonal occurrence. The first sentence should read: Swept and nonswept alternating tonal phrase types were the most abundant of the five types, comprising 1535 (46.3% and 1097 (33.1%). respectively, of the total 3315 PTH. * Cheers- Sara Heimlich CIMRS/NOAA Hatfield Marine Science Center, 2030 SE Marine Science Drive, Newport, Oregon 97365 (541) 867-0328