diff --git a/src/Base.lproj/MainMenu.xib b/src/Base.lproj/MainMenu.xib
index 78ec3c6..12fe162 100644
--- a/src/Base.lproj/MainMenu.xib
+++ b/src/Base.lproj/MainMenu.xib
@@ -160,7 +160,7 @@
                             </menuItem>
                             <menuItem title="Copy" keyEquivalent="c" id="x3v-GG-iWU">
                                 <connections>
-                                    <action selector="copy:" target="-1" id="G1f-GL-Joy"/>
+                                    <action selector="copy:" target="Voe-Tx-rLC" id="Lio-le-pYM"/>
                                 </connections>
                             </menuItem>
                             <menuItem title="Paste" keyEquivalent="v" id="gVA-U4-sdL">
diff --git a/src/Controller.swift b/src/Controller.swift
index 67dc44a..7ebf205 100644
--- a/src/Controller.swift
+++ b/src/Controller.swift
@@ -191,6 +191,13 @@ class Controller: NSObject, NSApplicationDelegate {
     })
   }
   
+  @IBAction func copy(_ sender: NSMenuItem) {
+    let pasteboard = NSPasteboard.general()
+    pasteboard.clearContents()
+    pasteboard.declareTypes([NSStringPboardType], owner: self)
+    pasteboard.setString(dataStorage.selection.joined(separator: ","), forType: NSStringPboardType)
+  }
+  
   @IBAction func toggleViewEdges(_ sender: NSMenuItem) {
     if let metalView = view as? MetalView {
       if metalView.viewEdges {
diff --git a/src/DataStorage.swift b/src/DataStorage.swift
index 39ebf44..0a45eee 100644
--- a/src/DataStorage.swift
+++ b/src/DataStorage.swift
@@ -69,6 +69,7 @@ class DataStorage: NSObject, NSOutlineViewDataSource, NSOutlineViewDelegate {
       }
       
       self.storeData(in: cityGMLParser)
+      cityGMLParser.clear()
       
       while self.view == nil {
         Thread.sleep(forTimeInterval: 0.01)