3 

 O 

 t/5 



CEL(4) 

 CEL (4) 

 CEL(4) 

 CEL (4) 



CEL (4) 

 CEL (4) 

 CEL (4) 

 CEL (4) 



CEL (4) 

 CEL (4) 

 CEL (4) 

 CEL (4) 



C 

 O 



bo 



c 

 _o 



s 



bo 

 C 



-C 

 U 



00\^}-Os vou-im^O r^Oc^rn 

 <N CN *-i <N IIIOt-h +rn 

 1 1 1 1 +1 + 



O 



r^t^r^r-- o\ o\ o\ Os n n rs m 



so 

 c 

 u 



to 



60 



c 

 U 



Ov * H N i- H H 03 r.-.OMO 

 + + + + l+^H^H | |(M 



1 1 1 



"3 



6 ~ 



rs m n n r^r^r^r^ n N M N 



^-t t-h .— < y-t mmrrim OOOO 



J3 



c 

 l) 



C/) 



<u 



c 

 H 



BO 



c 



-C 

 U 



m m cm in m m Th m somrnin 

 + + 1 +iii 



o ~ 



,_, tH i-l iH ^. ^. ^. ^. ,_, ,_, ^ ^ 



Q 



OOu-iu-. O O in in © O in in 

 m r*i rr, r^ rri m 



3 <~> 



O rt 

 Q. 73 



w 



N N H ^ N N H ^ <N CM .-< <*■ 

 O O 00 ^ OO00M3 OOOO^O 

 ■+ ■+ .-H m + t H tfi ^(-^j-^Hr^ 



< 



Molybdenum 

 Molybdenum 

 Molybdenum 

 Molybdenum 



Tantalum 

 Tantalum 

 Tantalum 

 Tantalum 



Columbium 

 Columbium 

 Columbium 

 Columbium 



251 



