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HFI Article about the Gates Twinjet
HFI Article about the Sikorsky H-3
HFI Article about the SR-N1 Hovercraft
HFI Article on Piasecki H-21
HFI Article on Sikorsky Black Hawk
HFI Article on Sikorsky S-51
HFI Article on the Sikorsky CH-37
HFI Contribution Thank You Letter from Frank Jensen
HFI Contribution Thank You Letter from Frank Jensen
HFI Document about Archives
HFI Fundraising Letter
HFI HELI-EXPO 1997
HFI HELICOPTER HISTORY
HFI HELICOPTER HISTORY LETTER FROM QUINTON & COMPANY
HFI HISTORIC - THE SIKORSKY S-58
HFI Interview with David Smith
HFI Letter about Ads from Bell
HFI Letter about Fund Drive
HFI Receives 690 Helicopter Models
HFI SUPPORT YOUR HELICOPTER HISTORY
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