'The Indexer appears four times a year in March, June, September and December and is available both in print and online. From its foundation in 1958 until 2007 (vols 1-25), it was published twice a year and volumes were biennial, consisting of 4 issues. Since going quarterly in 2008, volumes (still consisting of 4 issues) are annual.' (Source: http://www.theindexer.org/pub/data.htm )
