IPAC (Infrared Processing and Analysis Center, Pasadena, CA, USA) offers on-line access to its datasets and services. IPAC is a primary data node for the ADS (§3.4.1.), and provides several object catalogs which can be accessed independently (telnet to xcatscan.ipac.caltech.edu and login as user xcatscan). This service requires the user to run an X Windows server. Contact Rick Ebert rick@ipac.caltech.edu for further details. IPAC issues a Newsletter on paper; subscription requests, as well as general questions about network services at IPAC, should be sent to info@ipac.caltech.edu. IPAC supports the NASA/IPAC Extragalactic Database (see §3.2.8.) as well as the ISSA Postage Stamp Service (see §3.3.9.). [Reference: Ebert (1994).]