The search by "physical representation" does not work if the subfields 182 of the Unimarc field are filled in. It works if you fill out 106, but these subfields are outdated. 106 CODED DATA FIELD: TEXTUAL RESOURCE - FORM OF ITEM Field Definition This field contains coded data relating to the form of an item textual unmediated resources (i.e., no mediation device is required to use or perceive the textual content of the resource). Occurrence Optional. Not repeatable. Indicators Indicator 1: blank (not defined) Indicator 2: blank (not defined) Subfield $a Form of resource Item: Coded Data:Medium Designator A one character code indicates the physical medium of the resource item. The following codes are used: d = large print e = newspaper format f = Braille or Moon script g = microprint h = hand-written i = multimedia (e.g. a resource an item in regular print with a microfiche supplement) (obsolete) This code is replaced by field 182 Coded Data Field - Media type, $a/0 code "m"= "multiple media". j = mini-print r = regular print s = electronic (obsolete) This code is replaced by field 182 Coded Data Field - Media type, $a/0 code "b"= "electronic". To be used when resource Item is intended for manipulation by a computer. The resource item may reside in a carrier accessed either directly or remotely, in some cases requiring the use of peripheral devices attached to the computer. This code is not used for items that do not necessarily require the use of a computer (e.g. music compact discs, videodiscs). t = microform (obsolete) This code is replaced by field 182 Coded Data Field - Media type, $a/0 code "c"= "microform". z = other form of material Notes on Field Contents Where the textual material is regular print, the field may contain code 'r' or be omitted altogether. https://cdn.ifla.org/wp-content/uploads/files/assets/uca/unimarc_updates/BIBLIOGRAPHIC/b_106_update2016.pdf https://cdn.ifla.org/wp-content/uploads/files/assets/uca/unimarc_updates/BIBLIOGRAPHIC/b_182_new2016.pdf