| PERIODICAL TITLE | CODES | DATES |
| OASIS | CBW | 1998:09- |
| OASIS | NIC | CURRENT YEAR |
| OASIS | SHKA | CURRENT YEAR |
| OCCUPATIONAL OUTLOOK QUARTERLY | NIH | MFORM 1988:SP-1994:WI; 1990:01-CDROM |
| OCCUPATIONAL OUTLOOK QUARTERLY | RCH | 1997- |
| OCCUPATIONAL OUTLOOK QUARTERLY | SCH | 1990- |
| OCCUPATIONAL OUTLOOK QUARTERLY | SHH | 1990- |
| OCCUPATIONAL OUTLOOK QUARTERLY | WAH | MFORM 1979-1981 |
| OCEANS | WAH | MFORM 1987:01-1989:04 |
| ODYSSEY | AAH | 1995- |
| ODYSSEY | ACC | CURRENT YEAR |
| ODYSSEY | BEM | CURRENT 2 YEARS SCATTERED |
| ODYSSEY | BES | CURRENT YEAR |
| ODYSSEY | BHC | CURRENT YEAR |
| ODYSSEY | BHJ | CURRENT 5 YEARS |
| ODYSSEY | BKB | CURRENT ISSUE |
| ODYSSEY | BKW | CURRENT YEAR |
| ODYSSEY | CBW | 1993:09- |
| ODYSSEY | DUE | CURRENT YEAR |
| ODYSSEY | GUA | CURRENT 4 YEARS |
| ODYSSEY | GUL | CURRENT YEAR |
| ODYSSEY | GUM | 1980:04- |
| ODYSSEY | GUW | CURRENT YEAR |
| ODYSSEY | HEH | 1984:01- |
| ODYSSEY | MOJ | CURRENT 5 YEARS |
| ODYSSEY | NIC | CURRENT YEAR |
| ODYSSEY | NIJ | 1990-1996; 1998- |
| ODYSSEY | NIV | 1992- |
| ODYSSEY | RIH | 1996:09- |
| ODYSSEY | SCE | 1996:01- |
| ODYSSEY | SGS | CURRENT YEAR |
| ODYSSEY | SHE | 1995:01- |
| ODYSSEY | SHKA | CURRENT YEAR |
| ODYSSEY | SHM | 2002:-9- |
| ODYSSEY | SHW | CURRENT YEAR |
| ODYSSEY | SOF | CURRENT 2 YEARS |
| ODYSSEY | SOR | 1998:09-2003:03 |
| ODYSSEY | SOS | 1993:01-1998:12 |
| ODYSSEY | SOV | 1990- |
| ODYSSEY | WAE | CURRENT YEAR |
| OERI BULLETIN | NIH | 1991:SP-SCATTERED |
| OLD NEWS | GUM | 1992:09-1996:07/08 |
| OLD NEWS | NIR | 1997:10- |
| OMNI | GUH | 1990-1995:04 |
| OMNI | SNH | 1990- |
| OMNI | VOH | MFORM 1980-1994 |
| OMNI | WAH | MFORM 1991:09-1996 |
| ON | RCH | MFORM 1980-1995 |
| ONLINE SEARCHER | NIH | 1988:FA-1990:SU |
| OPERA NEWS | BMH | 1994- |
| OPERA NEWS | HNH | 1998 |
| OPRAH | BHH | 2002:08- |
| OPRAH | RCJ | CURRENT YEAR |
| ORGANIC GARDENING | NCH | 2000:01- |
| OUR SUNDAY VISITOR | BMH | CURRENT 2 YEARS |
| OUTDOOR LIFE | ACO | CURRENT YEAR CANNOT COPY |
| OUTDOOR LIFE | ACT | CURRENT YEAR CANNOT COPY |
| OUTDOOR LIFE | BEH | 1999:08- |
| OUTDOOR LIFE | BHH | 1998:01- |
| OUTDOOR LIFE | BKH | 1998- |
| OUTDOOR LIFE | CBH | 2001:01-2002:01 |
| OUTDOOR LIFE | CBW | 1997- |
| OUTDOOR LIFE | CHH | CURRENT 3 YEARS |
| OUTDOOR LIFE | DUH | 1999:01- |
| OUTDOOR LIFE | GIH | 1990-2000 ISSUES MISSING |
| OUTDOOR LIFE | GUH | 1990- |
| OUTDOOR LIFE | GUM | 1990:02- |
| OUTDOOR LIFE | MIH | 1998- |
| OUTDOOR LIFE | MOH | CURRENT 5 YEARS |
| OUTDOOR LIFE | MOJ | 1999:01- |
| OUTDOOR LIFE | NCH | CURRENT 4 YEARS |
| OUTDOOR LIFE | NIH | 1995:01- |
| OUTDOOR LIFE | NIJ | 1988-1995 |
| OUTDOOR LIFE | RCH | 1999-2002- |
| OUTDOOR LIFE | RCJ | CURRENT YEAR |
| OUTDOOR LIFE | RIH | CURRENT YEAR |
| OUTDOOR LIFE | SCH | 1998- |
| OUTDOOR LIFE | SGH | 1998- |
| OUTDOOR LIFE | SGJ | CURRENT 5 YEARS |
| OUTDOOR LIFE | SHH | 1995- |
| OUTDOOR LIFE | SHHS | 1999- |
| OUTDOOR LIFE | SHK | 2000:03- |
| OUTDOOR LIFE | SHM | CURRENT 2 YEARS |
| OUTDOOR LIFE | SNH | 2003-; MFORM 1978-1997 |
| OUTDOOR LIFE | SNU | 1987-1992- |
| OUTDOOR LIFE | SOH | 1998- |
| OUTDOOR LIFE | WAH | 1983-; MFORM 1974-1980; 1985-1986 |
| OUTSIDE | AAH | CURRENT YEAR |
| OUTSIDE | NIH | 1992:1-1995:06 SCATTERED |
| OUTSIDE | SOH | 1998:11- |
| OWL | ACE | CURRENT YEAR CANNOT COPY |
| OWL | ACS | CURRENT YEAR |
| OWL | BHC | CURRENT YEAR |
| OWL | BHP | CURRENT YEAR |
| OWL | BKB | CURRENT YEAR |
| OWL | BKW | CURRENT YEAR |
| OWL | GUA | CURRENT 4 YEARS |
| OWL | GUE | 1996-1999 |
| OWL | GUL | CURRENT YEAR |
| OWL | GUM | 1998:01- |
| OWL | MOP | CURRENT YEAR |
| OWL | NIG | CURRENT YEAR |
| OWL | NIL | CURRENT 2 YEARS |
| OWL | RIH | 1996:09- |
| OWL | SGS | CURRENT YEAR |
| OWL | SOF | CURRENT 2 YEARS |
| OWL | SOR | 1998:09-2003:03 |
| OWL | SOS | 2000:01- |
| OWL | SOV | CURRENT YEAR |
| OWL | VOE | CURRENT YEAR |