content: -----------------------------------------------------------------------------
  -- |
  -- Module      :  Data.Units.Imperial
  -- Copyright   :  (C) 2013 Richard Eisenberg
  -- License     :  BSD-style (see LICENSE)
  -- Maintainer  :  Richard Eisenberg (rae@cs.brynmawr.edu)
  -- Stability   :  experimental
  -- Portability :  non-portable
  --
  -- This module defines the Imperial system of units, based on the
  -- Exchequer Standards of 1825. Two big differences between the
  -- Imperial system and the US customary one are that because the
  -- USA declared their independence from the UK in 1776, the US
  -- customary system is based on the previous Winchester Standards, and
  -- that the Imperial system uses the same units for dry and fluid
  -- measures. This module gathers together a subjective set of units of
  -- general use appearing <https://en.wikipedia.org/wiki/Imperial_units
  -- here>, submodules will gather measures of more limited use. It also
  -- exports type instances 'DefaultUnitOfDim' that use the /SI/ internal
  -- representations. This choice is made for inter-compatibility with SI
  -- computations. If you want the foot-pound-second system, use the 'FPS'.
  --
  -- Where possible, reference have been made to UK legislation. However,
  -- Wikipedia's page is /much/ better organized than any government
  -- resource immediately available.
  --
  -- The UK legislation used as references are as follows:
  -- <http://www.legislation.gov.uk/ukpga/1985/72/enacted>
  -- <http://www.legislation.gov.uk/uksi/1994/2867/schedule/part/VI/made>
  -- <http://www.legislation.gov.uk/uksi/1995/1804/schedule/made>
  -----------------------------------------------------------------------------
  
  module Data.Units.Imperial (
    -- * Lengths
    Thou(..), Inch(..), Foot(..), Yard(..), Mile(..), NauticalMile(..),
  
    -- * Velocity
    Knot(..),
  
    -- * Area
    Acre(..),
  
    -- * Volume
    FluidOunce(..), Pint(..), Quart(..), Gallon(..),
  
    -- * Mass
    -- | These are all in the avoirdupois system
    Ounce(..), Pound(..), Stone(..), Ton(..),
  
    -- * Pressure
    InchOfWater(..),
  
    -- * Energy
    FootPoundForce(..), Therm(..), BritishThermalUnit(..),
  
    -- * Power
    Horsepower(..),
  
    -- * Temperature
    Fahrenheit(..)
    ) where
  
  import Data.Units.Imperial.Misc
  import Data.Units.Imperial.Nautical
  import Data.Units.Imperial.Weight
  import Data.Units.Imperial.Volume
  import Data.Units.Imperial.Area
  import Data.Units.Imperial.Length
  