- Current (Hits: 5898)
- Cylinder (Hits: 557)
- Darcy (Hits: 482)
- Datasheets (Hits: 1165)
- Deflection (Hits: 6018)
- Density (Hits: 8721)
- Design (Hits: 3730)
- Design Classification (Hits: 258)
- Diagonal (Hits: 1605)
- Differential (Hits: 6338)
- Diffusion (Hits: 3842)
- Dimensionless Numbers (Hits: 244)
- Displacement (Hits: 5566)
- Drawings (Hits: 14498)
- Drill Pipe (Hits: 117)
- Drilling (Hits: 716)
- Drilling Bit (Hits: 101)
- Drilling Cement (Hits: 139)
- Drilling Mud (Hits: 157)
- Drilling Pump (Hits: 122)