ID non-fiction picture books - bread factory & dairy farm

Do any of you remember an illustrated book about dairies that 
explained where milk and ice cream come from and how they are 
made?

It may have featured happy kids visiting the farm or maybe it 
was just happy kids getting ice cream from the ice cream truck.  
There may have been a picture of a milk truck.  There may have 
been a scene wherein a kitten gets a squirt of milk straight 
from the udder.  Then again, that may have just been a kitten 
watching the process.

---

Do any of you remember an illustrated book about bakeries 
that explained where commercial quantity bread comes from 
and how it is made?  I can picture one page showing a giant 
rectangular loaf of dough rising in a huge rectangular metal 
pan.  This image in my mind was of a color page.  Maybe it 
was two such giant loaves, side by side.

---

They were flimsy volumes, perhaps 10 to 20 pages long, probably
softbound.  They may have been given out to young students on
a tour of the factory or dairy.  For instance, Weber's Bread
factory or Wonder Bread Factory may have printed the bakery
one.

They must have been published before 1974, and may have been 
published before 1969.

Can any of you remember any more details about this book?

NarniaFan