Examples of the type
ND (1982) Signatures: ACV, CRAM
ND (1982) Signatures: ACF, CRAM
ND (1990) Signatures: ORK, CSS
ND (1992) Signatures: RFS, JEP
ND (1994) Signatures: CAB, JEM
ND (1995) – not listed in PrattSignatures: EICV, DCBnot listed in Pratt
ND (1995) Signatures: CAB, DCB