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| Release: 1967 Revision: 1st edition, 176 pages Author: Tom Mulvey, Harriet Adams, Grace Grote Publisher: Grosset & Dunlap Summary: The boys become involved with international spy agencies as they search for their kidnapped father... more >> Locations: Bayport, NY / Claymore, NY / Darville (east US) / Granton (northcentral US) / Burnsbie (east US) / Boston, MA Prestwick, Scotland / Ianburgh, England / Stornoway, SCO / Perth, SCO / Edinburgh, SCO / Westboro (east US) Personal Ranking: 31 / 58 |
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| The Series: 46 - 50 |
| Release: 1968 Revision: 1st edition, 174 pages Author: Jerrold Mundis Publisher: Grosset & Dunlap Summary: The Hardys investigate a strange "society" and a carnival for clues to the theft of an ivory statue... more >> Locations: Bayport, NY / Mystic, CT / New York City, NY / Los Angeles, CA / Newton, NY Personal Ranking: 50 / 58 |
| Release: 1969 Revision: 1st edition, 176 pages Author: Andrew Svenson Publisher: Grosset & Dunlap Summary: While looking for an insurance beneficiary in Iceland, the boys help locate a kidnapped US astronaut... more >> Locations: Bayport, NY / New York City, NY / Keflavik, Iceland / Reykjavik, ICE / Akureyri, ICE / Narssarssuaq, Greenland Personal Ranking: 20 / 58 |
| Release: 1970 Revision: 1st edition, 180 pages Author: Vincent Buranelli Publisher: Grosset & Dunlap Summary: By dialing a wrong number, the Hardys end up in a theft case involving matters of national security... more >> Locations: Bayport, NY / Washington D.C. / Baltimore, MD / Pittsburgh, PA Personal Ranking: 5 / 58 |
| Release: 1971 Revision: 1st edition, 175 pages Author: Andrew Svenson Publisher: Grosset & Dunlap Summary: The boys track a gang of credit card swindlers, and a group of jewel thieves, to the MidWest US... more >> Locations: Bayport, NY / (various MidWest towns) / Denver, CO / Snowcap, CO / Blackfoot Meadow, CO Personal Ranking: 2 / 58 |
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