Spacing in X30 fields:
No spaces are used in initialisms.
Examples:
830 #0$aSpecial publication of the IEEE Power Engineering Society ;$vno. 19.
130 0#$aBible.$pN.T.$pMatthew.
One space is used between preceding and succeeding initials if an abbreviation consists of more than a single letter.
Example:
830 #0$aMineral resources series (Morgantown, W. Va.) ;$vMRS-7B.