Band:   Weedeater
Album:  Sixteen Tons
Song:   Bull
Tuning: D Standard

Main Riff
d |------------------------------------------------------------------|
A |------------------------------------------------------------------|
F |------------------------------------------------------------------|
C |--7s9---12--9--9----7s9---12--9--8----7s9---12--9--8--7-----------|
G |--5s7---10--7--7----5s7---10--7--6----5s7---10--7--6--5--9--8--7--|
D |------0-----------0-----0-----------0-----0--------------7--6--5--|

Chorus Riff A
d |---------------------------------------|
A |---------------------------------------|
F |---------------------------------------|
C |---------9-7---------------------------|
G |---------7-5-9-8----5s7---5s7---5s7-5--|
D |--0--0-0-----7-6--0-3s5-0-3s5-0-3s5-3--|
Chorus Riff B
 
d |----------------------------------------|
A |----------------------------------------|
F |----------------------------------------|
C |---------9-7----------------------------|
G |---------7-5-9-8--7---------------------|
D |--0--0-0-----7-6--5---------------------|

This next part is in 3/4 timing. 
I've marked the accented notes with "*", otherwise the tab gets a bit confusing.
Outro Riff A
d |-----------------------------------------------------|
A |-----------------------------------------------------|
F |-----------------------------------------------------|
C |-----------------------------------------------------|
G |-----------------------------------------------------|
D |--0------0------0------0------6------5------6--5--3--|
     *      *      *      *      *      *      *
Outro Riff B 
d |-----------------------------------------------------|
A |-----------------------------------------------------|
F |-----------------------------------------------------|
C |-----------------------------------------------------|
G |---------7-------------7------8------7------8--7--5--|
D |--0--0-0-0--0-0-0--0-0-0--0-0-6------5------6--5--3--|
     *      *      *      *      *      *      *