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diff --git a/Principles_Of_Geotechnical_Engineering/Chapter18.ipynb b/Principles_Of_Geotechnical_Engineering/Chapter18.ipynb
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+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:c0db9cffec0e49340dfb3b8ea72b7fe58131405a32fcba0dd38be68beb6719b2"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter18-Subsoil Exploration"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Ex1-pg642"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#Determine the correctedstandard penetration numbers, (N1)60, at various depths\n",
+      "import math\n",
+      "##solving for z=5 only\n",
+      "To=0.275\n",
+      "Cn=To**(-0.5)\n",
+      "N60=8\n",
+      "N160=Cn*N60\n",
+      "print'%s %.1f %s'%('(N1)60 = ',N160,'')\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "(N1)60 =  15.3 \n"
+       ]
+      }
+     ],
+     "prompt_number": 1
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Ex2-pg643"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#estimate the average soil friction angle,f\u0003, from z\u00020 to z\u000225 ft\n",
+      "#import math\n",
+      "z=5.\n",
+      "To=0.275\n",
+      "Cn=2./(1.+To)\n",
+      "N60=8.\n",
+      "N160=Cn*N60\n",
+      "print'%s %.1f %s'%('(N1)60 = ',N160,'')\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "(N1)60 =  12.5 \n"
+       ]
+      }
+     ],
+     "prompt_number": 2
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Ex3-pg643"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#estimate the average soil friction angle, f\u0003, from z\u00020 to z\u000225 ft\n",
+      "import math\n",
+      "pa=1. ## 14.7 lb/in**2 = 1ton/ft**2\n",
+      "To=0.275 ## ton/ ft**2\n",
+      "N60=8.\n",
+      "c= math.atan((N60/12.2+20.3*(To/pa))*57.3)**0.34\n",
+      "print'%s %.1f %s'%('The average soil friction angle = ',c,'')\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "The average soil friction angle =  1.2 \n"
+       ]
+      }
+     ],
+     "prompt_number": 3
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file