65-Cross Mark (DF)
************************
The Cross Mark (DF) command is used to create quick cross marks in AutoCAD.
Step:
1-Load the "65-CROSS MARK (DF).lsp" into your AutoCAD
2-Type "DF" in the command line and press "Enter".
3-Select first and second point.
4-Type Distance Value and press enter.
5-Type Length Value and press enter.
6-A cross mark will be placed at the chosen points.

66-Twisted Pair (2WIST)
The Twisted Pair (2WIST) command is used to create twisted pair.
Step:
1-Load the "66-TWISTED PAIR (2WIST).LSP" into your AutoCAD
2-Type "2WIST" in the command line.
3-Provide the diameter and angle.
4-Pick first and second point.
5-Get the result.

67-Free Hand (FHAND)
************************
The Free Hand (FHAND) command is used to convert any line pline
into free hand.
Step:
1-Load the "67-FREE HAND (FHAND).LSP" into your AutoCAD
2-Type "FHAND" in the command line.
3-Choose average segment length, & curve offset.
4-Select object press "Enter".

68-Erase Inside (EICP)
************************
The Erase Inside (EICP) command is used to erase the objects in side closed pline.
Step:
1-Load the "68-Erase Inside (EICP).lsp" into your AutoCAD
2-Type "EICP" in the command line.
3-Click over the closed pline.
4-Result inside objects removed.

69-Break Line (BREAKAT)
************************
The Break Line (BREAKAT) command is used to break line pline at any point.
Step:
1-Load the "69-Break Line (BREAKAT).lsp" into your AutoCAD
2-Type "BREAKAT" in the command line.
3-Click over the point of line pline.

70-Block Area (BAREA)
************************
The Block Area (BAREA) command is used to find area for any closed pline in the block.
Step:
1-Load the "70-Block Area (BAREA).lsp" into your AutoCAD
2-Type "BAREA" in the command line.
3-Click over the block closed pline.

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Learning AutoLISP & Visual LISP
*******************************
00. Introduction
01. LISP Formatting
02. LISP Functionality
03. Visual LISP Introduction
04. Working with Strings
05. Working with Lists
06. Getting Data From Users
07. Loops
08. Selection Sets
09. Working with Geometry
10. Creating and Editing Graphic Entities
11. Creating and Editing Non-Graphic Entities
12. Storing Data
13. Loading LISPs and Error Trapping
14. Conclusion

A Guide to Programming the Lisp Machine (2nd ed.)