The issues of SAG 1999 contains many interesting articles. You can find a list of them here and here. The June-Sept issue was megathick one in honor of Nils William Olsson on his 90th birthday.
Every issue also contains a query section and often an ahnentafel , sent in by a reader.
There are also book reviews and much more. If you wish to subscribe, send an e-mail to Swenson Swedish Immigration Research Center . Here you can find a list of all articles published since 1981. Issues older than 1989 are available from the Swenson Center. An important part of the SAG idea is also the weeklong SAG Workshop, that takes place every year in Salt Lake City.