• 21
    A Nature of Things special presentation ; Canadian Broadcasting Corporation in association with Discovery Science ; Altau/Tuttifrutti in association with Radio-Canada, the CBC, Discovery Science and the Office National du Film.
    Toronto : CBC Learning, 2007.
    DVD, Videocassette
    options Options

  • 22
    a production of Passion Pictures, Thirteen and the BBC in association with WNET New York Public Media ; produced by David Allen.
    [Arlington, Va.] : PBS : PBS Distribution, c2011. Widescreen.
    DVD
    options Options

  • 23
    WQED/Pittsburgh in association with National Academy of Sciences ; producer, Gregory Andorfer ; screenwriters, Gregory Andorfer, Georgann Kane.
    Pittsburg, PA : WQED : National Academy of Sciences, 1986.
    Videocassette
    options Options

  • 24
    a production of BelugaSmile Productions and Thirteen Productions LLC for WNET ; written and produced by Ana E. Salceda.
    [Arlington, Virginia] : Distributed by PBS Distribution, [2014]
    DVD
    options Options

  • 25
    BBC Earth ; 2 Entertain ; a BBC/Animal Planet co-production ; produced by Ian Gray & Mary Summerill.
    Burbank, CA : BBC/Warner Home Video, c2011. Widescreen version.
    DVD
    options Options

  • 26
    [Toronto, Ont.] : Canadian Broadcasting Corp. , 2010 : CBC Learning [distributor] Widescreen
    DVD
    options Options

  • 27
    [Toronto, Ont.] : Canadian Broadcasting Corp., 2010 : CBC Learning [distributor] Widescreen
    DVD
    options Options

  • 28
    BBC Worldwide Ltd. ; British Broadcasting Corporation ; 2 Entertain Video Limited ; a Wildvision/National Geographic Channel US co-production ; series producer, Patrick Morris ; producers, Patrick Morris, Andrew Murray.
    [New York] : BBC Video : Distributed by BBC Worldwide Americas ; Burbank, CA : Distributed by Warner Home Video, 2007.
    DVD
    options Options

  • 29
    co-produced by Thirteen Productions LLC and BBC in association with WNET ; produced by Sally Thomson ; series producer, Bill Murphy.
    [Arlington, Virginia] : PBS Distribution, [2015]
    DVD
    options Options

  • 30
    a production of Florentine Films and WETA Television ; written by Dayton Duncan ; produced by Dayton Duncan and Ken Burns.
    [United States] : PBS Home Video ; Hollywood, Calif. : Distributed by Paramount Home Entertainment, c2009.
    DVD
    options Options

  • 31
    WQED/Pittsburgh in association with National Academy of Sciences ; producer, Gregory Andorfer ; screenwriters, Gregory Andorfer, Georgann Kane.
    Pittsburg, PA : WQED : National Academy of Sciences, 1986.
    Videocassette
    options Options

  • 32
    A co-production of the Thirteen Productions LLC and BBC in association with WNET ; produced and directed by Rob Sullivan.
    DVD
    options Options

  • 33
    Canadian Broadcasting Corporation ; produced in association with Arte France ; executive producer, Michael Allder ; written and directed by Mark Johnston ; produced by Barbara Barde and Mark Johnston.
    Toronto, ON : CBC Learning, c2007.
    DVD
    options Options

  • 34
    CBC Learning in association with National Geographic Channel; series producer, Michael Allder; narrated by David Suzuki.
    Toronto : CBC Learning [distributor], 2010.
    DVD
    options Options

  • 35
    Toronto, ON : Canadian Broadcasting Corp. : CBC Learning [distributor], 2008.
    DVD
    options Options

  • 36
    [Toronto, Ont.] : Canadian Broadcasting Corp., 2010 : CBC Learning [distributor] Widescreen.
    DVD
    options Options

  • 37
    2Entertain.
    Burbank, CA : Warner Home Video, c2007.
    DVD
    options Options

  • 38
    WQED/Pittsburgh in association with National Academy of Sciences ; producer, Gregory Andorfer ; screenwriters, Gregory Andorfer, Georgann Kane.
    Pittsburg, PA : WQED : National Academy of Sciences, 1986.
    Videocassette
    options Options

  • 39
    Coy Wolf Inc. in assocation with Thirteen Productions LLC ; produced and directed by Susan Fleming.
    [United States] : PBS, [2014]
    DVD
    options Options

  • 40
    options Options

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