This My Time at Portia mod adds three levels to each of the resource delivery systems, with both increased maximum deliveries and new delivery items and bonuses. The additions are as follows:
Tree Farm Delivery:
Level 6: adds honey, honeybee wax, royal honey, and aroma apples; adds chance of poplar wood, bird's nest, honeycomb --
Level 7: adds poplar wood --
Level 8: adds purple resin --
Mine Delivery:
Level 6: adds topaz, rock salt, and crystal; adds chance of sapphire --
Level 7: adds sapphire, zeolite, and sulfate; adds chance of rubies --
Level 8: adds rubies; add chance of diamonds --
Credits: aedenthorn