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published detailed procedures for recording ships by means of
measured drawings and photographs.  All pre-1946 ships should be
evaluated according to the National Register's criteria of
Historic structures and objects such as these are
preservation puzzles.  While many continue in use (and undergo
repair and updating) , their historic integrity needs to be
recognized and protected.  When a historic facility or object is
taken out of service, the best method of preservation may be
mothballing to protect it from decay or collapse.  Finding new
uses for historic structures and equipment is not as simple as it
is for historic buildings.  Hangars, for instance, may be made
into offices or workshops without destroying the historic fabric
of the building; but cranes, drydocks, and ramps may not be easy
to adapt to other purposes.  Functional additions may be made if
care is taken not to harm the historical integrity of the
structure.  Handling nontraditional historic structures needs
assistance from a specialist in industrial and engineering
history or industrial archeology.  In some instances, these
structures are best left in place if they cannot be preserved and
It is important to survey and evaluate non-traditional
facilities in order to separate those that are of distinct
cultural importance, such as the ones noted above, from those
that are merely old or that are less important because there are
other, better examples elsewhere.  Since it is especially hard to
preserve working industrial facilities without change, this
determination becomes critical.  Historic preservation treatment
may not be appropriate for some significant structures because of
their continually evolving use.  Formal documentation may satisfy
the regulations in such cases.  In other cases, historical
integrity has been long lost, so they do not meet the National
Register's criteria of significance and therefore need not be
considered for preservation.
In cases of national emergency, such as war or a natural
disaster, federal regulations may suspend the effects of the
National Historic Preservation Act for varying periods of time
(See 36 CFR 800.12).


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