:'''<nowiki>#</nowiki>''' = Information not available

::Used for received single-part or completed multipart units or for continuing resources that have ceased.

::Used for serial or non serial units when the units are on order but have not yet been acquired.

::Used for serial units when published pieces are routinely being received.

::Used for serial units when newly published pieces are not being received, whatever the reason, by the reporting location.

'''$a/1 Method of acquisition'''