publications (specifically technical communications or reports).
Alternatively, it may refer to the series. Context of the World List 45imp4
In this reference system, "" is an abbreviation commonly used for Imperial or Imprenta (printing/press), and " 4 " typically denotes a specific volume or entry index. Based on the cataloguing style of the World List of Scientific Periodicals , this code points to: 45imp4
Could you clarify if you are looking for the indexed under this code, or a description of the periodical itself? 45imp4