The following species give promise of furnish~ng substitutes 
for sprwoe as above but more experimeits are neede(I in order 
to overcome known difficulties before these species can be 
recommended: Bald cypress, Amabilis, Grand., Ioble, and 
rhite firs, Lodgepole pine, ITorway pine, andIZ Redwood. The 
following species are lighter 4,hran spruce but could be used 
in parts where the stresses are relatively low: Incense 
cedar, Western rel cedar arn  Alpine fir. AS conditions 
change oth~er species "J2. doubtless come into consideration 
under these vari ous heaA..