| Hay 8 enlaces en la categoría Reference |
 Astronomical Constants from NASA
Astronomical/space :l: constants :l: and :l: equations.
http://www.ksc.nasa.gov/facts/faq04.html
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Beta-Theta
Gives :l: general :l: defintions, :l: background :l: and :l: examples :l: from :l: the :l: science :l: fields :l: of :l: biology, :l: physics, :l: chemistry, :l: math, :l: and :l: history. :l: :l: :l: Includes :l: forum :l: boards.
http://www.beta-theta.com/
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EquationSheet.com
Searchable :l: directory, :l: arranged :l: by :l: field, :l: of :l: equations, :l: constants, :l: symbols :l: and :l: SI :l: units. :l: :l: Also :l: features :l: LaTEX :l: utilities, :l: software :l: links.
http://www.equationsheet.com/
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GrayLIT Network
Searchable :l: database :l: for :l: reports :l: that :l: are :l: generated :l: by :l: federally :l: funded :l: projects.
http://www.osti.gov/graylit/
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Physics and Science Reference by PhysLINK.com
Includes :l: physical :l: constants, :l: online :l: unit :l: conversions, :l: periodic :l: table :l: of :l: elements, :l: exact :l: time, :l: fundamental :l: physical :l: formulae :l: and :l: equations.
http://www.physlink.com/Reference/Index.cfm
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RefScout
A :l: weekly, :l: scientific :l: reference :l: mailing :l: service. :l: :l: Screens :l: databases :l: covering :l: life :l: and :l: medical :l: sciences :l: for :l: the :l: key :l: words :l: or :l: the :l: combination :l: of :l: key :l: words :l: specified :l: and :l: will :l: automatically :l: update :l: :l: with :l: any :l: abstract :l: that :l: has :l: come :l: up :l: during :l: the :l: last :l: seven :l: days. :l: :l: Free :l: service.
http://www.refscout.com/
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Studies Made Easy
Offers :l: homework :l: help, :l: math :l: tricks, :l: science :l: news, :l: periodic :l: table, :l: and :l: a :l: discussion :l: forum.
http://www.beta-theta.com/
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The Constants and Equations Pages
Expanding :l: reference :l: resource :l: for :l: science, :l: math :l: and :l: astronomy
http://www.tcaep.co.uk/
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