Searching for collector's numbers.

[Roger Horton]

AO Hume (with a lot of help from WH Griffin) numbered the vast majority of his sheets, even those coming from other herbaria. Sometimes a large specimen was divided between several sheets e.g. a recent Rumex hydrolapathum is on 5132-5136 (cross-referencing as far as I can see), of which only two have been documented so far. Eventually it may be possible to search for these giving collector, date, location, and taxon. I notice, though, collectors numbers are not searchable, nor do they appear in the tsv files downloaded from 'Maps and reports'.

Is there a solution please?