Diablo – Do tomes of jewelcrafting/blacksmithing drop in inferno mode

There is no real reward such as a useful item. However, you do get various achievements and some XP for each book.

The meta achievement is Grand Lorekeeper of Sanctuary

Here is the full list of "read lore" achievements:

• http://d3db.com/achievement/i/historian-of-the-high-heavens
• http://d3db.com/achievement/i/historian-of-arreat
• http://d3db.com/achievement/i/historian-of-caldeum
• http://d3db.com/achievement/i/historian-of-tristram
• http://d3db.com/achievement/i/archival-studies
• http://d3db.com/achievement/i/espionage
• http://d3db.com/achievement/i/eavesdropper
• http://d3db.com/achievement/i/taking-notes
• http://d3db.com/achievement/i/know-it-all
• http://d3db.com/achievement/i/primary-sources
• http://d3db.com/achievement/i/judge-of-character
• http://d3db.com/achievement/i/a-quick-study
• http://d3db.com/achievement/i/beastmaster-of-the-high-heavens
• http://d3db.com/achievement/i/beastmaster-of-arreat
• http://d3db.com/achievement/i/beastmaster-of-caldeum
• http://d3db.com/achievement/i/beastmaster-of-tristram

Total Blacksmith Leveling Cost and Materials

• 593,000 gold
• 50 Page of Blacksmithing
• 50 Tome of Blacksmithing
• 35 Tome of Secrets

Source

Total Jeweler Leveling Cost and Materials

• 140,000 gold
• 20 Page of Jewelcrafting
• 20 Tome of Jewelcrafting
• 40 Tome of Secrets

Source

Drop Rate and place

 - Page of Blacksmithing  - Drops in Nightmare, Hell, Inferno difficulty
 - Tome of Blacksmithing  - Drops in Hell, Inferno difficulty
 - Tome of Secrets        - Drops in Inferno difficulty

 - Page of Jewelcrafting  - Drops in Nightmare, Hell, Inferno difficulty
 - Tome of Jewelcrafting  - Drops in Hell, Inferno difficulty
 - Tome of Secrets        - Drops in Inferno difficulty

These items do not drop in Normal mode

Source

Aside the above information, there are reports about pages droping in ACT IV normal.¹²

I believe is because some monster have a iLv in ACT IV normal equivalent to the early monsters from nightmare (Like the gems, where you get better quality based on the item level), but I couldn't find source to support (or to invalid) this information. (still looking)