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Could we please not make the mistake of thinking every field is worth the
same? Of the fields below (see my report below), some do not appear at all
within the WorldCat aggregation, whereas others appear a significant amount
and a bunch are somewhere in between. If a tag only appears 33 times out of
nearly 300 million MARC records, it likely isn't as important as one that
appears over 50 million times. Just sayin'.
Roy Tennant
OCLC Research

Out of 289,294,984 WorldCat records as of 1 January 2013:

016 (vital for Canadian libraries) - 50,439,937
055 (vital for Canadian libraries) - 3,201,913
060 (vital for medical libraries) - 2,190,698
070 (vital for agricultural libraries) - 1,069,479
080 (important for some European libraries) - 9,601,435
OCLC's 090 - 12,166,182
OCLC's 092 - 4,915,415
210 - 806,622
222 - 1,358,049
245$h - 79,201,026 
247 - 242,964
264 - 53,586
336 - 198,637
337 - 199,079
338 - 140,598
440 - 2,852
400 - 33
410 - 9
411 - 0
503 (although obsolete, they exist in records) - 0
506 - 8,113,210
538 - 10,079,036
540 - 13,952,558
546 - 23,424,048
611 - 318,521
77X - multiple fields
78X - multiple fields
800 - 1,171,608
810 - 2,427,695
811 - 18,994
830 - 47,490,770


On 1/27/13 1/27/13  5:19 PM, "J. McRee Elrod" <[log in to unmask]> wrote:

>>  https://github.com/lcnetdev/marc2bibframe/blob/master/python/lib/marc.py.
>> Anyone experiencing a sleepless night should consider this task :-).
> 
> 
> Again, interesting.
> 
> Many MARC fields and subfields are not named, e.g.:
> 
> All fixed fields 
> 016 (vital for Canadian libraries)
> 055 (vital for Canadian libraries)
> 060 (vital for medical libraries)
> 070 (vital for agricultural libraries)
> 080 (important for some European libraries)
> OCLC's 090, 092
> 210 
> 222 
> (but seldom used 243 is included)
> 245$h 
> 247
> 264
> 336
> 337
> 338 
> 440, 400, 410, 411, 503 (although obsolete, they exist in records)
> All 5XX notes seem undifferentiated except 505, 520, and 521, making a
>   walk back to MARC impossible.
> 506
> 538
> 540
> 546
> 611
> 77X 
> 78X
> 800
> 810
> 811
> 830 
> etc.
> 
> These missing fields are just those we have used, or often use,
> without reference to MARC21 fields given in documentation, which are
> *much* more extensive.
> 
> So far, this seems a *very* dumbed down conversion, lacking information
> important to our clients.
> 
> 
>    __       __   J. McRee (Mac) Elrod ([log in to unmask])
>   {__  |   /     Special Libraries Cataloguing   HTTP://www.slc.bc.ca/
>   ___} |__ \__________________________________________________________
>