Sentence:  With regard to materials, all the frames should be of oak and so should the stem piece, stern post, upper portion of dead woods, knight heads, apron, beams, shelf clamp, bilge <WSD>strakes</WSD>, and keelson; the keel will generally be found to be either English or American elm. The garboard <WSD>strakes</WSD> are generally of American elm, and it is best that the planking above should be of American elm or oak to within a foot or so of the load water-line, and teak above to the covering board or deck edge. 
Meaning of the word marked with <WSD> tags:  A continuous line of plates or planks running from bow to stern that contributes to a vessel's skin. (FM 55-501).